iPhone控件之UIImageView

- (void)viewDidLoad {
    
    [super viewDidLoad];
    
    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;
    
    [myImageView release];
}

UIImageView2

- (void)viewDidLoad {
    
    [super viewDidLoad];
    
    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];
    
    [arrImages release];
    [myImageView release];
}