IOS-----UILabel动画

1.创建一个UILabel

 self.redView = [[UIView alloc] initWithFrame:CGRectMake(150, 400, 100, 100)];
    _redView.backgroundColor = [UIColor redColor];
    [self.view addSubview:_redView];

2.动画创建

（1）使用block动画

//渐变 alpha 0全透明  1不透明
- (void)test1{
    //现将初始状态改为全透明
    //_redView.alpha = 0;
    
    //使用block动画
    void (^block)(void) = ^{
        self.redView.alpha = 1;
   };
   [UIView animateWithDuration:1 animations:block];
    [UIView animateWithDuration:1 animations:^{
        self.redView.alpha = 0;
    }];
}

（2）frame移动

- (void)test2{
    [UIView animateWithDuration:1 animations:^{
        //放大 width height
        //self.redView.frame = CGRectMake(150, 200, 100*0.5, 100*0.5);
        
        //移动 150 200 100 100
        self.redView.center = CGPointMake(self.redView.center.x , self.redView.center.y - 150);
    }];
}

（3）弹簧效果

- (void)test4{
    //弹簧效果
    [UIView animateWithDuration:1 delay:0 usingSpringWithDamping:0.2 initialSpringVelocity:0.1 options:UIViewAnimationOptionCurveLinear animations:^{
        self.redView.frame = CGRectMake(150, 100, 100, 100);
        self.redView.frame = CGRectMake(150, 400, 200, 200);
    } completion:^(BOOL finished) {
        
    }];
}

3.动画设置

- (void)test3{
    self.redView.alpha = 1;  
    //开始动画设置
    [UIView beginAnimations:nil context:nil];
    //设置动画的时间
    [UIView setAnimationDuration:2];
    //设置代理
    [UIView setAnimationDelegate:self];
    //动画效果的节奏为满进慢出
    [UIView setAnimationCurve:UIViewAnimationCurveEaseInOut];
    [UIView setAnimationRepeatAutoreverses:NO];   
    //设置具体的动画
    [UIView setAnimationTransition:UIViewAnimationTransitionCurlUp forView:self.redView cache:NO];
    //要干什么
    //删除红色的视图
    self.redView.alpha = 0;
    //提交动画
    [UIView commitAnimations];
}

（2）触碰开始

- (void)viewDidAppear:(BOOL)animated{
    [super viewDidAppear:animated];
    [self test1];
}

（3）触碰停止恢复原始状态

-(void)animationDidStop:(NSString *)animationID finished:(NSNumber *)finished context:(void *)context{
    [self.redView removeFromSuperview];
}

4.动画实现

- (void)touchesBegan:(NSSet<UITouch *> *)touches withEvent:(UIEvent *)event{
    [self test4];
}

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