iphone 开发基本控件or常用功能 方法or函数

未声明变量多位全局变量，未添加方法名多为viewDidLoad方法，所有方法均在控制器.m内。

GRectMake自定义视图"纯代码绘制视图"：（添加到viewDidLoad方法中）

	CGRect lblFrame = CGRectMake(110,10,200,40);                        //视图在屏幕上的位置与大小
	UILabel *lblLocalized = [[UILabel alloc] initWithFrame:lblFrame];   //初始化一个UILabel
	lblLocalized.backgroundColor = [UIColor clearColor];                //给视图背景色，这里设置透明
	lblLocalized.text = NSLocalizedString(@"HelloKey",nil);             //UILable的内容
	[self.view addSubview:lblLocalized];                                //添加到view上

设置view背景：（添加到viewDidLoad方法中）

	[self.view setBackgroundColor:[UIColor redColor]];

提示对话框：（添加到viewDidLoad方法中）

	UIActionSheet *mySheet = [[UIActionSheet alloc] initWithTitle:@"Email Deletion Options" 
														 delegate:self 
												cancelButtonTitle:@"Cancel" 
										   destructiveButtonTitle:@"Delete Everything" 
												otherButtonTitles:@"All Read Email", @"Spam Only",nil];
	
	
	mySheet.actionSheetStyle = UIActionSheetStyleBlackOpaque;
	[mySheet showInView:self.view];

等待对话框：（添加到viewDidLoad方法中）

	[self.view setBackgroundColor:[UIColor blackColor]];//等待框是白色，所以设置背景突出视图
	
	UIActivityIndicatorView *myActivityView = [[UIActivityIndicatorView alloc] 
											   initWithActivityIndicatorStyle:UIActivityIndicatorViewStyleWhiteLarge];
	
	CGRect activityFrame = CGRectMake(130,100,50,50);
	[myActivityView setFrame:activityFrame];
	
	[myActivityView startAnimating];
	
	[self.view addSubview:myActivityView];

提示对话框：（添加到viewDidLoad方法中）

	UIAlertView *myAlert = [[UIAlertView alloc] initWithTitle:@"title" 
													  message:@"This alert will disappear in 3 seconds" 
													 delegate:self 
											cancelButtonTitle:@"OK" 
											otherButtonTitles:nil];
	
	[myAlert addButtonWithTitle:@"new button"];
	[myAlert addButtonWithTitle:@"another button"];
	
	[myAlert show];

UIButton和UICheckBox：（添加到viewDidLoad方法中）

	//rounded-rect button
	UIButton *roundedRectButton = [UIButton buttonWithType:UIButtonTypeRoundedRect];//Button类型
	
	CGRect buttonRect = CGRectMake(100,50,100,35);//位置大小
	[roundedRectButton setFrame:buttonRect];
	
	[roundedRectButton setTitle:@"Normal" forState:UIControlStateNormal];//按钮未按
	[roundedRectButton setTitle:@"Highlighted" forState:UIControlStateHighlighted];//按钮按下
	roundedRectButton.showsTouchWhenHighlighted = YES;//高亮
	
    [roundedRectButton addTarget:self action:@selector(buttonDown:) forControlEvents:UIControlEventTouchDown];
    [roundedRectButton addTarget:self action:@selector(buttonRelease:) forControlEvents:UIControlEventTouchUpInside];
	
	//checkbox control
	UIButton *checkbox = [UIButton buttonWithType:UIButtonTypeCustom];
	
	CGRect checkboxRect = CGRectMake(135,150,36,36);
	[checkbox setFrame:checkboxRect];
	
	[checkbox setImage:[UIImage imageNamed:@"checkbox_off.png"] forState:UIControlStateNormal];//普通状态
	[checkbox setImage:[UIImage imageNamed:@"checkbox_on.png"] forState:UIControlStateSelected];//选中状态
	
    [checkbox addTarget:self action:@selector(checkboxClick:) forControlEvents:UIControlEventTouchUpInside];
	
	//custom circular button
	UIButton *circularButton = [UIButton buttonWithType:UIButtonTypeCustom];
	
	CGRect circularRect = CGRectMake(80,220,165,164);
	[circularButton setFrame:circularRect];
	
	UIImage *buttonImage = [UIImage imageNamed:@"circular_button.png"];
	[circularButton setImage:buttonImage forState:UIControlStateNormal];
	
    //按钮按下
    [circularButton addTarget:self action:@selector(buttonDown:) forControlEvents:UIControlEventTouchUpInside];

	//add all the buttons to the main view
	[self.view addSubview:roundedRectButton];	
	[self.view addSubview:checkbox];	
	[self.view addSubview:circularButton];

时间选择器

	CGRect pickerFrame = CGRectMake(0,120,0,0);
	
	UIDatePicker *myPicker = [[UIDatePicker alloc] initWithFrame:pickerFrame];
	[myPicker addTarget:self action:@selector(pickerChanged:) forControlEvents:UIControlEventValueChanged];
	
	[self.view addSubview:myPicker];

图片显示 并进行缩放

	UIImage *anImage = [UIImage imageNamed:@"apple.png"];
	UIImageView *myImageView = [[UIImageView alloc] initWithImage:anImage];
	
	[[self view] addSubview:myImageView];
	
	//scale our height and width by 50%
	CGSize viewSize = myImageView.bounds.size;
	viewSize.width = viewSize.width * 0.5; //make our width 50% smaller
	viewSize.height = viewSize.height; //keep height the same
	
	CGRect newFrame = CGRectMake(0,0,viewSize.width, viewSize.height);
	[myImageView setFrame:newFrame];
	myImageView.contentMode = UIViewContentModeScaleAspectFit;

图片切换

	NSArray *arrImages = [[NSArray alloc] initWithObjects:
						  [UIImage imageNamed:@"apple.png"],
						  [UIImage imageNamed:@"apple2.png"],
						  [UIImage imageNamed:@"apple3.png"],nil];
	
	CGRect viewFrame = CGRectMake(0,0,200,200);
	UIImageView *myImageView = [[UIImageView alloc] initWithFrame:viewFrame];
	
	[myImageView setAnimationImages:arrImages];
	
	[myImageView setAnimationRepeatCount:0];
	[myImageView setAnimationDuration:0.5];
	
	[self.view addSubview:myImageView];
	[myImageView startAnimating];

显示多行字Label

	CGRect labelFrame = CGRectMake(10,10,200,44);
	
	UILabel *myLabel = [[UILabel alloc] initWithFrame:labelFrame];
	
	myLabel.backgroundColor = [UIColor clearColor];
	myLabel.textColor = [UIColor redColor];
	myLabel.font = [UIFont fontWithName:@"Verdana" size:18.0];
	
	myLabel.numberOfLines = 2;
	myLabel.text = @"Hello World\nSecond line";
	
	myLabel.shadowColor = [UIColor darkGrayColor];
	myLabel.shadowOffset = CGSizeMake(1.0,1.0);
	
	[self.view addSubview:myLabel];

分页视图UIPageControl

UIScrollView *myScrollView;
UIPageControl *myPageControl;

- (void)loadScrollViewWithPage:(UIView *)page 
{
	int pageCount = [[myScrollView subviews] count];
	
	CGRect bounds = myScrollView.bounds;
    bounds.origin.x = bounds.size.width * pageCount;
    bounds.origin.y = 0;
    page.frame = bounds;
    [myScrollView addSubview:page];
}

- (void)createPages
{
	CGRect pageRect = myScrollView.frame;
	
	//create pages
	UIView *page1 = [[UIView alloc] initWithFrame:pageRect];
	page1.backgroundColor = [UIColor blueColor];
	UIView *page2 = [[UIView alloc] initWithFrame:pageRect];
	page2.backgroundColor = [UIColor redColor];
	UIView *page3 = [[UIView alloc] initWithFrame:pageRect];
	page3.backgroundColor = [UIColor greenColor];
	
	//add to scrollview
	[self loadScrollViewWithPage:page1];
	[self loadScrollViewWithPage:page2];
	[self loadScrollViewWithPage:page3];
}

- (void)viewDidLoad {
	
	[super viewDidLoad];
	
	float pageControlHeight = 18.0;
	int pageCount = 3;
	
	CGRect scrollViewRect = [self.view bounds];
	scrollViewRect.size.height -= pageControlHeight;
	
	//create scrollview
	myScrollView = [[UIScrollView alloc] initWithFrame:scrollViewRect];
	myScrollView.pagingEnabled = YES;
	myScrollView.contentSize = CGSizeMake(scrollViewRect.size.width * pageCount,1);
	myScrollView.showsHorizontalScrollIndicator = NO;
	myScrollView.showsVerticalScrollIndicator = NO;
	myScrollView.delegate = self;
	
	//create pageview
	CGRect pageViewRect = [self.view bounds];
	pageViewRect.size.height = pageControlHeight;
	pageViewRect.origin.y = scrollViewRect.size.height;
	
	myPageControl = [[UIPageControl alloc] initWithFrame:pageViewRect];
	myPageControl.backgroundColor = [UIColor blackColor];
	myPageControl.numberOfPages = pageCount;
	myPageControl.currentPage = 0;
	[myPageControl addTarget:self action:@selector(changePage:) forControlEvents:UIControlEventValueChanged];
	
	//create pages
	[self createPages];
	
	//add to main view
	[self.view addSubview:myScrollView];
	[self.view addSubview:myPageControl];
}

- (void)scrollViewDidScroll:(UIScrollView *)sender 
{
	CGFloat pageWidth = sender.frame.size.width;
    int page = floor((sender.contentOffset.x - pageWidth / 2) / pageWidth) + 1;
    myPageControl.currentPage = page;
}

- (void)changePage:(id)sender
{
	int page = myPageControl.currentPage;
	
	// update the scroll view to the appropriate page
    CGRect frame = myScrollView.frame;
    frame.origin.x = frame.size.width * page;
    frame.origin.y = 0;
    [myScrollView scrollRectToVisible:frame animated:YES];
}

选择器UIPickerView

- (void)viewDidLoad {
	
	[super viewDidLoad];
	
	CGRect pickerFrame = CGRectMake(0,120,0,0);
	
	UIPickerView *myPicker = [[UIPickerView alloc] initWithFrame:pickerFrame];
	myPicker.dataSource = self;
	myPicker.delegate = self;
	myPicker.showsSelectionIndicator = YES;
	
    [self.view addSubview:myPicker];	
}

- (NSInteger)numberOfComponentsInPickerView:(UIPickerView *)pickerView {
	
	return 1;	
}

- (NSInteger)pickerView:(UIPickerView *)pickerView numberOfRowsInComponent:(NSInteger)component {
	
	return 10;
}

- (NSString *)pickerView:(UIPickerView *)thePickerView titleForRow:(NSInteger)row forComponent:(NSInteger)component {
	
	return [NSString stringWithFormat:@"Row %i",row];
}

多项选择器UIPickerView

NSMutableArray *comp1;
NSMutableArray *comp2;

-(void)initComp1
{
	comp1 = [[NSMutableArray alloc] init];
	UIImageView *imgView;
	
	imgView = [[UIImageView alloc] initWithImage:[UIImage imageNamed:@"au.png"]];
	[comp1 addObject:imgView];
	
	imgView = [[UIImageView alloc] initWithImage:[UIImage imageNamed:@"ca.png"]];
	[comp1 addObject:imgView];

	imgView = [[UIImageView alloc] initWithImage:[UIImage imageNamed:@"gb.png"]];
	[comp1 addObject:imgView];
	
	imgView = [[UIImageView alloc] initWithImage:[UIImage imageNamed:@"nz.png"]];
	[comp1 addObject:imgView];

	imgView = [[UIImageView alloc] initWithImage:[UIImage imageNamed:@"us.png"]];
	[comp1 addObject:imgView];
}

-(void)initComp2
{
	comp2 = [[NSMutableArray alloc] init];
	UILabel *lbl;
	
	lbl = [[UILabel alloc] initWithFrame:CGRectMake(0,0,100,44)];
	lbl.backgroundColor = [UIColor clearColor];
	lbl.text = @"Red";
	[comp2 addObject:lbl];
	
	lbl = [[UILabel alloc] initWithFrame:CGRectMake(0,0,100,44)];
	lbl.backgroundColor = [UIColor clearColor];
	lbl.text = @"Blue";
	[comp2 addObject:lbl];

	lbl = [[UILabel alloc] initWithFrame:CGRectMake(0,0,100,44)];
	lbl.backgroundColor = [UIColor clearColor];
	lbl.text = @"Yellow";
	[comp2 addObject:lbl];

	lbl = [[UILabel alloc] initWithFrame:CGRectMake(0,0,100,44)];
	lbl.backgroundColor = [UIColor clearColor];
	lbl.text = @"Pink";
	[comp2 addObject:lbl];

	lbl = [[UILabel alloc] initWithFrame:CGRectMake(0,0,100,44)];
	lbl.backgroundColor = [UIColor clearColor];
	lbl.text = @"Brown";
	[comp2 addObject:lbl];
	
	lbl = [[UILabel alloc] initWithFrame:CGRectMake(0,0,100,44)];
	lbl.backgroundColor = [UIColor clearColor];
	lbl.text = @"Black";
	[comp2 addObject:lbl];

	lbl = [[UILabel alloc] initWithFrame:CGRectMake(0,0,100,44)];
	lbl.backgroundColor = [UIColor clearColor];
	lbl.text = @"White";
	[comp2 addObject:lbl];
}

- (void)viewDidLoad {
	
	[super viewDidLoad];
	
	//create some sample data
	[self initComp1];	
	[self initComp2];	
	
	CGRect pickerFrame = CGRectMake(0,120,0,0);
	
	UIPickerView *myPicker = [[UIPickerView alloc] initWithFrame:pickerFrame];
	myPicker.dataSource = self;
	myPicker.delegate = self;
	myPicker.showsSelectionIndicator = YES;
	
	[self.view addSubview:myPicker];	
}

- (NSInteger)numberOfComponentsInPickerView:(UIPickerView *)pickerView {
	
	return 2;	
}

- (NSInteger)pickerView:(UIPickerView *)pickerView numberOfRowsInComponent:(NSInteger)component {
	
	if (component == 0)
		return [comp1 count];
	else
		return [comp2 count];
}

- (CGFloat)pickerView:(UIPickerView *)pickerView widthForComponent:(NSInteger)component
{
	if (component == 0)
		return 100.0;
	else
		return 200.0;
}

- (UIView *)pickerView:(UIPickerView *)pickerView 
			viewForRow:(NSInteger)row 
		  forComponent:(NSInteger)component 
		   reusingView:(UIView *)view {
	
	if (component == 0)
		return [comp1 objectAtIndex:row];
	else
		return [comp2 objectAtIndex:row];
}

- (void)pickerView:(UIPickerView *)pickerView didSelectRow:(NSInteger)row inComponent:(NSInteger)component {
	
	NSLog(@"row: %i, component:%i",row,component);
}

滚动条UIProgressView

NSTimer *timer;

- (void)updateProgress:(NSTimer *)sender
{
	UIProgressView *progress = [sender userInfo];
	
	//have we completed?
	if (progress.progress == 1.0)
		[timer invalidate];
	else
		progress.progress += 0.05;
}

- (void)viewDidLoad {
	
    [super viewDidLoad];
	
	UIProgressView *myProgressView = [[UIProgressView alloc] initWithProgressViewStyle:UIProgressViewStyleDefault];
	
	CGRect progressFrame = CGRectMake(10,100,300,25);
	[myProgressView setFrame:progressFrame];
	
	[myProgressView setProgress:0.0];
	
	[self.view addSubview:myProgressView];
	
	[myProgressView release];
	
	//create timer
	timer = [[NSTimer scheduledTimerWithTimeInterval:0.1 
											  target:self 
											selector:@selector(updateProgress:) 
											userInfo:myProgressView 
											 repeats:YES] retain];
}

scrollView

	[super viewDidLoad];

	CGRect scrollFrame = CGRectMake(20,90,280,280);
	UIScrollView *scrollView = [[UIScrollView alloc] initWithFrame:scrollFrame];
	scrollView.minimumZoomScale = 0.5;
	scrollView.maximumZoomScale = 2.0;
	scrollView.delegate = self;
	
	UIImage *bigImage = [UIImage imageNamed:@"appleLogo.jpg"];
	largeImageView = [[UIImageView alloc] initWithImage:bigImage];
	
	[scrollView addSubview:largeImageView];
	scrollView.contentSize = largeImageView.frame.size; //important!
	
	[self.view addSubview:scrollView];

标签视图UISegment

- (void)segmentClick:(id)sender
{
	NSLog(@"you selected segment %d",[sender selectedSegmentIndex]);
}

- (void)viewDidLoad {
	
    [super viewDidLoad];
	
	NSArray *arrSegments = [[NSArray alloc] initWithObjects:
							[NSString stringWithString:@"0"],
							[NSString stringWithString:@"1"],
							[NSString stringWithString:@"2"],nil];
	
	UISegmentedControl *mySegment = [[UISegmentedControl alloc] initWithItems:arrSegments];
	
	CGRect segmentRect = CGRectMake(10,50,300,40);
	[mySegment setFrame:segmentRect];
	
	[mySegment addTarget:self action:@selector(segmentClick:) forControlEvents:UIControlEventValueChanged];
	
	[mySegment setSegmentedControlStyle:UISegmentedControlStyleBar];
	[mySegment setTintColor:[UIColor darkGrayColor]];
	
	//select first item
	[mySegment setSelectedSegmentIndex:0];
	
	//change a segment size
	[mySegment setWidth:120.0 forSegmentAtIndex:1];
	
	//add a new segment
	[mySegment insertSegmentWithTitle:@"new" atIndex:2 animated:YES];

	//add segment to main view
	[self.view addSubview:mySegment];	
}

进度条UISlider

UILabel *lblSliderValue;

-(void)sliderAction:(id)sender
{
	int stepAmount  = 10;
	float stepValue = (abs([(UISlider *)sender value]) / stepAmount) * stepAmount;
	[sender setValue:stepValue];
	
	lblSliderValue.text = [NSString stringWithFormat:@"%d",(int)stepValue];
}


- (void)viewDidLoad {
	
    [super viewDidLoad];
	
	CGRect sliderRect = CGRectMake(20,50,280,40);
	UISlider *mySlider = [[UISlider alloc] initWithFrame:sliderRect];
	
	mySlider.minimumValue = 0;
	mySlider.maximumValue = 100;
	mySlider.continuous   = YES;
	
	//images
	UIImage *leftTrackImage  = [[UIImage imageNamed:@"left_slider.png"] stretchableImageWithLeftCapWidth:5.0 topCapHeight:0.0];
	UIImage *rightTrackImage = [[UIImage imageNamed:@"right_slider.png"] stretchableImageWithLeftCapWidth:5.0 topCapHeight:0.0];
	UIImage *thumbImage      = [UIImage imageNamed:@"apple_thumb.png"];
	UIImage *minSliderImage  = [UIImage imageNamed:@"apple_min.png"];
	UIImage *maxSliderImage  = [UIImage imageNamed:@"apple_max.png"];
	
	[mySlider setThumbImage:thumbImage forState:UIControlStateNormal];
	[mySlider setMinimumTrackImage:leftTrackImage forState:UIControlStateNormal];
	[mySlider setMaximumTrackImage:rightTrackImage forState:UIControlStateNormal];
	[mySlider setMinimumValueImage:minSliderImage];
	[mySlider setMaximumValueImage:maxSliderImage];
	[mySlider setValue:50.0f];
	
	//handle value change events
	[mySlider addTarget:self action:@selector(sliderAction:) forControlEvents:UIControlEventValueChanged];
	
	//label to show current value
	CGRect lblRect = CGRectMake(145,100,100,20);
	lblSliderValue = [[UILabel alloc] initWithFrame:lblRect];
	lblSliderValue.backgroundColor = [UIColor clearColor];
	
	lblSliderValue.text = [NSString stringWithFormat:@"%d",(int)mySlider.value];
	
	//add slider to main view
	[self.view addSubview:mySlider];	
	[self.view addSubview:lblSliderValue];	
}

UITextField

- (void)viewDidLoad {
	
	[super viewDidLoad];
	
	CGRect textRect = CGRectMake(10,10,300,31);
	UITextField *myTextField = [[UITextField alloc] initWithFrame:textRect];
	myTextField.borderStyle = UITextBorderStyleRoundedRect;
	
	myTextField.font = [UIFont systemFontOfSize:22.0];
	myTextField.adjustsFontSizeToFitWidth = YES;
	myTextField.minimumFontSize = 2.0;
	
	myTextField.clearButtonMode = UITextFieldViewModeWhileEditing;
	myTextField.keyboardType = UIKeyboardTypeDefault;
	
	myTextField.autocorrectionType = UITextAutocorrectionTypeNo;
	myTextField.autocapitalizationType = UITextAutocapitalizationTypeNone;
	myTextField.returnKeyType = UIReturnKeyDone;
	
	//myTextField.secureTextEntry = YES;
	
	myTextField.delegate = self;
	
	[self.view addSubview:myTextField];
	
	//force keyboard to show immediately
	[myTextField becomeFirstResponder];
}

- (BOOL)textFieldShouldReturn:(UITextField *)textField
{
	[textField resignFirstResponder];
	return YES;
}

- (BOOL)textField:(UITextField *)textField shouldChangeCharactersInRange:(NSRange)range replacementString:(NSString *)string
{	
	 //limit text field to 10 chars
	 int MAX_CHARS = 10;
	 NSMutableString *newText = [NSMutableString stringWithString:textField.text];
	 [newText replaceCharactersInRange:range withString:string];
	 return ([newText length] <= MAX_CHARS);
}

文本输入

UIScrollView *myScrollView;
UITextView *myTextView;

-(void)buttonClick:(id)sender
{
	[myTextView resignFirstResponder];
}

- (void)viewDidLoad {
	
	[super viewDidLoad];
	
	CGRect viewRect = [self.view bounds];
	myScrollView = [[UIScrollView alloc] initWithFrame:viewRect];
	myScrollView.contentSize = viewRect.size;
	[self.view addSubview:myScrollView];
	
	CGRect buttonFrame = CGRectMake(10,10,60,32);
	UIButton *keyboardToggle = [UIButton buttonWithType:UIButtonTypeRoundedRect];
	[keyboardToggle setTitle:@"hide" forState:UIControlStateNormal];
	[keyboardToggle addTarget:self action:@selector(buttonClick:) forControlEvents:UIControlEventTouchUpInside];
	keyboardToggle.frame = buttonFrame;
	[myScrollView addSubview:keyboardToggle];
	
	CGRect textRect = CGRectMake(10,60,300,200);
	myTextView = [[UITextView alloc] initWithFrame:textRect];
	
	myTextView.font = [UIFont systemFontOfSize:22.0];
	
	myTextView.keyboardType = UIKeyboardTypeDefault;
	myTextView.returnKeyType = UIReturnKeyGo;
	
	//uncomment to enable data detectors
	//myTextView.text = @"this is a link: http://google.com ";
	//myTextView.dataDetectorTypes = UIDataDetectorTypeAll;
	//myTextView.enabled = NO;
	
	myTextView.delegate = self;
	
	[myScrollView addSubview:myTextView];
}

- (void)textViewDidBeginEditing:(UITextView *)textView 
{ 
	float keyboardHeight;
	if ([UIDevice currentDevice].orientation == UIDeviceOrientationPortrait | UIDeviceOrientationPortraitUpsideDown)
		keyboardHeight = 216.0;
	else
		keyboardHeight = 162.0;
	
	CGRect textViewRect = textView.frame;
	float textViewBottom = textViewRect.origin.y + textViewRect.size.height;
	
	CGRect viewRect = [myScrollView bounds];
	float keyboardTop = viewRect.size.height-keyboardHeight;
	
	float scrollOffset = fabs(textViewBottom - keyboardTop);
	
	[myScrollView setContentOffset:CGPointMake(0, scrollOffset) animated:YES];  
}

- (void)textViewDidEndEditing:(UITextView *)textView 
{
	[myScrollView setContentOffset:CGPointMake(0, 0) animated:YES];  
}

UIToolbar

- (void)buttonClick:(id)sender {
	
	NSLog(@"you clicked button: %@",[sender title]);
}

- (void)viewDidLoad {
	
	[super viewDidLoad];
	
	CGSize viewSize = self.view.frame.size;
	float toolbarHeight = 44.0;
	CGRect toolbarFrame = CGRectMake(0,viewSize.height-toolbarHeight,viewSize.width,toolbarHeight);

	UIToolbar *myToolbar = [[UIToolbar alloc] initWithFrame:toolbarFrame];
	
	myToolbar.autoresizingMask = UIViewAutoresizingFlexibleWidth 
								 | 
								 UIViewAutoresizingFlexibleLeftMargin 
								 | 
								 UIViewAutoresizingFlexibleRightMargin 
								 | 
								 UIViewAutoresizingFlexibleTopMargin;
	
	UIBarButtonItem *button1 = [[UIBarButtonItem alloc] initWithTitle:@"button 1" 
																style:UIBarButtonItemStylePlain target:self 
															   action:@selector(buttonClick:)];
	
	UIBarButtonItem *button2 = [[UIBarButtonItem alloc] initWithTitle:@"button 2" 
																style:UIBarButtonItemStyleBordered 
															   target:self 
															   action:@selector(buttonClick:)];
	
	UIBarButtonItem *button3 = [[UIBarButtonItem alloc] initWithImage:[UIImage imageNamed:@"apple_icon.png"] 
																style:UIBarButtonItemStyleBordered 
															   target:self 
															   action:@selector(buttonClick:)];
	
	UIBarButtonItem *flexButton = [[UIBarButtonItem alloc] initWithBarButtonSystemItem:UIBarButtonSystemItemFlexibleSpace 
																				target:nil 
																				action:nil];
	
	UIBarButtonItem *trashButton = [[UIBarButtonItem alloc] initWithBarButtonSystemItem:UIBarButtonSystemItemTrash 
																				 target:self 
																				 action:@selector(buttonClick:)];
	
	NSArray *buttons = [[NSArray alloc] initWithObjects:button1,button2,button3, flexButton,trashButton,nil];
	
	[myToolbar setItems:buttons animated:NO];
	
	[self.view addSubview:myToolbar];
	
}

- (BOOL)shouldAutorotateToInterfaceOrientation:(UIInterfaceOrientation)interfaceOrientation {
	
	return YES;
}

自定义UIView

- (void)viewDidLoad {
	
    [super viewDidLoad];
	
	CGPoint frameCenter = self.view.center;
	float width = 50.0;
	float height = 50.0;
	
	CGRect viewFrame = CGRectMake(frameCenter.x-width,frameCenter.y-height, width*2, height*2);
	UIView *myView = [[UIView alloc] initWithFrame:viewFrame];
	myView.backgroundColor = [UIColor blueColor];
	
	//create subview
	CGRect subViewFrame = CGRectInset(myView.bounds, width/2.0, height/2.0);
	UIView *mySubview = [[UIView alloc] initWithFrame:subViewFrame];
	mySubview.backgroundColor = [UIColor yellowColor];
	
	//set autoresizing mask
	mySubview.autoresizingMask = UIViewAutoresizingFlexibleWidth | UIViewAutoresizingFlexibleHeight;
	
	[myView addSubview:mySubview];
					  
	[[self view] addSubview:myView];
	
	//animate resize
	[UIView beginAnimations:nil context:NULL];
	
	[UIView setAnimationDuration:1.0];
	viewFrame = CGRectInset(viewFrame, -width, -height);
	[myView setFrame:viewFrame];
	
	[UIView commitAnimations];	
}

UIWebView

- (void)viewDidLoad {
	
	[super viewDidLoad];
	
	[self.view setBackgroundColor:[UIColor blackColor]];
	
	CGRect webRect = CGRectMake(10,10,300,380);
	UIWebView *myWebView = [[UIWebView alloc] initWithFrame:webRect];
	myWebView.scalesPageToFit = YES;
	
	myWebView.delegate = self;
	
	NSURL *url = [NSURL URLWithString:@"http://www.google.com"];
	NSURLRequest *request = [NSURLRequest requestWithURL:url];
	[myWebView loadRequest:request];
	
	[self.view addSubview:myWebView];
	
	activity = [[UIActivityIndicatorView alloc] initWithActivityIndicatorStyle:UIActivityIndicatorViewStyleWhiteLarge];
	[activity setCenter:CGPointMake(160,420)];
	[self.view addSubview:activity];	
}

- (void)webViewDidStartLoad:(UIWebView *)webView
{
	[activity startAnimating];
}

- (void)webViewDidFinishLoad:(UIWebView *)webView
{
	[activity stopAnimating];
	[webView stringByEvaluatingJavaScriptFromString:@"alert('Finished Loading!');"];
}

- (void)webView:(UIWebView *)webView didFailLoadWithError:(NSError *)error
{
	[activity stopAnimating];
	NSLog(@"Error: %@",error);
}