iOS9 视图弹出的弹簧效果

iOS9 视图弹出的弹簧效果

Spring Animationring Animation）：

：

[UIView animateWithDuration:4.0 // 动画时长
                      delay:0.0 // 动画延迟
     usingSpringWithDamping:1.0 // 类似弹簧振动效果 0~1
      initialSpringVelocity:5.0 // 初始速度
                    options:UIViewAnimationOptionCurveEaseInOut // 动画过渡效果
                 animations:^{
                     // code...
                     CGPoint point = _imageView.center;
                     point.y += 150;
                     [_imageView setCenter:point];
                 } completion:^(BOOL finished) {
                     // 动画完成后执行
                     // code...
                     [_imageView setAlpha:1];
                 }];

usingSpringWithDamping：它的范围为 0.0f 到 1.0f ，数值越小「弹簧」的振动效果越明显。

initialSpringVelocity：初始的速度，数值越大一开始移动越快。值得注意的是，初始速度取值较高而时间较短时，也会出现反弹情况。

转：Spring Animation 是线性动画或 ease-out 动画的理想替代品。由于 iOS 本身大量使用的就是 Spring Animation，用户已经习惯了这种动画效果，因此使用它能使 App 让人感觉更加自然，用 Apple 的话说就是「instantly familiar」。此外，Spring Animation 不只能对位置使用，它适用于所有可被添加动画效果的属性。

#import "ViewController.h"

@interface ViewController ()

@property(nonatomic, strong)UIImageView *imageView;

@end

@implementation ViewController

- (void)viewDidLoad {
    [super viewDidLoad];
    
    UIImage *iamge = [UIImage imageNamed:@"chengxuyuan.png"];
    
    CGSize size = iamge.size;
    NSLog(@"the size is %@", NSStringFromCGSize(size));
    
    _imageView = [[UIImageView alloc] initWithFrame:CGRectMake(100, 100, 100, 100)];
    
    _imageView.image = [UIImage imageNamed:@"chengxuyuan.png"];
    
    [self.view addSubview:_imageView];
    
    UITapGestureRecognizer *tapRecognizerRadar = [[UITapGestureRecognizer alloc] initWithTarget:self action:@selector(handleTapGestureRadar:)];
    [_imageView addGestureRecognizer:tapRecognizerRadar];
    _imageView.userInteractionEnabled = YES;

    CGAffineTransform fromTransform = CGAffineTransformScale(_imageView.transform, 0.2, 0.2);
    [_imageView setTransform:fromTransform];
//    CGAffineTransform toTransform = CGAffineTransformConcat(_imageView.transform,  CGAffineTransformInvert(_imageView.transform));
//    CGAffineTransform toTransform2 = CGAffineTransformScale(toTransform, 1.3, 1.3);
    
    [UIView animateWithDuration:1.0 // 动画时长
                          delay:0.0 // 动画延迟
         usingSpringWithDamping:0.4 // 类似弹簧振动效果 0~1
          initialSpringVelocity:5.0 // 初始速度
                        options:UIViewAnimationOptionCurveEaseInOut // 动画过渡效果
                     animations:^{
                         // code...
//                         CGPoint point = _imageView.center;
//                         point.y += 150;
//                         [_imageView setCenter:point];
                         [_imageView setTransform:fromTransform];
                         _imageView.transform = CGAffineTransformMakeScale(1.0f, 1.0f);
                         
                     } completion:^(BOOL finished) {
                         // 动画完成后执行
                         // code...
                         [_imageView setAlpha:1];
                     }];
//

    

}

- (void)handleTapGestureRadar:(UITapGestureRecognizer *)sender {
    [UIView animateWithDuration:0.35 animations:^{
//        _imageView.frame = self.view.bounds;
        _imageView.transform = CGAffineTransformMakeScale(20.0f, 20.0f);
        _imageView.alpha = 0;
    } completion:^(BOOL finished) {
    }];
    
}