轉場動畫

#import "ViewController.h"
#define IMAGE_COUNT 4

@interface ViewController ()
{
    CATransition *_transaction;
    UIImageView *_image;
    int _currentImage;//圖片名稱
}
@end

@implementation ViewController

- (void)viewDidLoad {
    [super viewDidLoad];
    _image=[[UIImageView alloc]initWithFrame:[[UIScreen mainScreen]bounds]];
    _image.contentMode=UIViewContentModeScaleAspectFill;//按比例填滿屏幕
    _image.image=[UIImage imageNamed:[NSString stringWithFormat:@"%i",_currentImage]];
    [self.view addSubview:_image];
    
    //添加手勢---左劃
    UISwipeGestureRecognizer *left=[[UISwipeGestureRecognizer alloc]initWithTarget:self action:@selector(leftSwipe:)];
    left.direction=UISwipeGestureRecognizerDirectionLeft;//設置手勢方向
    [self.view addGestureRecognizer:left];//添加到屏幕上
    
    //添加手勢---右劃
    UISwipeGestureRecognizer *right=[[UISwipeGestureRecognizer alloc]initWithTarget:self action:@selector(rightSwipe:)];
    right.direction=UISwipeGestureRecognizerDirectionRight;
    [self.view addGestureRecognizer:right];

}

- (void) leftSwipe : (UISwipeGestureRecognizer *) swipeGesture{
    [self transitionAnimation:YES];
}
- (void) rightSwipe : (UISwipeGestureRecognizer *) swipeGesture{
    [self transitionAnimation:NO];
}

- (void) transitionAnimation:(BOOL) isNext{
    //1.建立動畫對象
    _transaction=[[CATransition alloc]init];
    //2.設置動畫類型，對於蘋果官方沒有公開的動畫類型只能使用字符串
    //cube  立方體翻轉效果
    //oglFlip 翻轉效果
    //suckEffect 收縮效果
    //rippleEffect 水滴波紋效果
    //pageCurl 向上翻頁效果
    //pageUnCurl  向下翻頁效果
    //cameralTrisHollowOpen 攝像頭打開效果
    //cameraIrisHollowClose 攝像頭關閉效果
    _transaction.type=@"rippleEffect";
    if (isNext) {
        _transaction.subtype=kCATransitionFromLeft;
    }else{
        _transaction.subtype=kCATransitionFromRight;
    }
    //設置動畫時間
    _transaction.duration=4;
    //設置翻轉後的圖片
    if (isNext) {
        _currentImage=(_currentImage+1) % IMAGE_COUNT;
    }else{
        _currentImage=(_currentImage- 1 + IMAGE_COUNT) %IMAGE_COUNT;
    }
    //添加動畫
    _image.image=[UIImage imageNamed:[NSString stringWithFormat:@"%i",_currentImage]];
    [_image.layer addAnimation:_transaction forKey:@"YC"];
    
}

- (void)didReceiveMemoryWarning {
    [super didReceiveMemoryWarning];
    // Dispose of any resources that can be recreated.
}

@end