iOS回彈動畫效果

建立一個項目，然後在storyboard中放入一個View並用autolayout設定View的位置

和上邊的距離（設定Y）

離左邊的距離（設定X）

設定大小

給View拖一個輸出口

在viewDidLoad中添加給view添加拖動手勢

- (void)viewDidLoad {    [super viewDidLoad];    //添加拖動手勢    UIPanGestureRecognizer *pan = [[UIPanGestureRecognizer alloc] initWithTarget:self action:@selector(handlePan:)];    [self.springbackView addGestureRecognizer:pan];    // Do any additional setup after loading the view, typically from a nib.}

接下來，實現handlePan:

- (void)handlePan:(UIPanGestureRecognizer*) recognizer{        CGPoint translation = [recognizer translationInView:self.view];    recognizer.view.center = CGPointMake(recognizer.view.center.x + translation.x,                                         recognizer.view.center.y + translation.y);    [recognizer setTranslation:CGPointZero inView:self.view];        if (recognizer.state == UIGestureRecognizerStateEnded) {            [UIView animateWithDuration:0.3 delay:0 usingSpringWithDamping:0.5 initialSpringVelocity:10 options:0 animations:^{            [self.springbackView layoutIfNeeded];    } completion:nil];            }}

OK,現在運行你的程式對View進行拖動吧。。。