ios 實現圖片倒影

原始碼下載：http://download.csdn.net/detail/x1135768777/4281079

- (void)viewDidLoad{    [super viewDidLoad];        [[[self view] layer] setBackgroundColor:[[UIColor blackColor] CGColor]];         UIImage *balloon = [UIImage imageNamed:@"1.png"];                       //改一片名就行了        CALayer *topLayer = [[CALayer alloc] init];         [topLayer setBounds:CGRectMake(0.0f, 0.0f, 320.0, 240)];         [topLayer setPosition:CGPointMake(160.0f, 120.0f)];         [topLayer setContents:(id)[balloon CGImage]];        [[[self view] layer] addSublayer:topLayer];        CALayer *reflectionLayer = [[CALayer alloc] init];         [reflectionLayer setBounds:CGRectMake(0.0f, 0.0f, 320.0, 240.0)];         [reflectionLayer setPosition:CGPointMake(160.0f, 310.0f)];        [reflectionLayer setContents:[topLayer contents]];        [reflectionLayer setValue:[NSNumber numberWithFloat:180.0] forKeyPath:@"transform.rotation.x"];        CAGradientLayer *gradientLayer = [[CAGradientLayer alloc] init];         [gradientLayer setBounds:[reflectionLayer bounds]];         [gradientLayer setPosition:CGPointMake([reflectionLayer bounds].size.width/2, [reflectionLayer bounds].size.height/2)];        [gradientLayer setColors:[NSArray arrayWithObjects: (id)[[UIColor clearColor] CGColor],(id)[[UIColor blackColor] CGColor], nil]];        [gradientLayer setStartPoint:CGPointMake(0.5,0.35)];         [gradientLayer setEndPoint:CGPointMake(0.5,1.0)];        [reflectionLayer setMask:gradientLayer];        [[[self view] layer] addSublayer:reflectionLayer];// Do any additional setup after loading the view, typically from a nib.}