如何动画浮动UIView在ObjectiveC

Question

我试图让一个UIView动画作为浮动对象，或作为气球：D UIView在屏幕的中间，我希望它保持随机浮动它的第一个启动点。没有穿过屏幕或类似的东西，只是漂浮在它周围5个像素的区域。

有什么建议吗？ ：d

我尝试这样做：

[UIView animateWithDuration:0.1 
         delay:0.0 
        options: UIViewAnimationOptionRepeat | UIViewAnimationOptionAutoreverse | UIViewAnimationOptionAllowUserInteraction 
       animations:^{ 
        myCircleUIView.transform = CGAffineTransformMakeTranslation([self randomFloatingGenerator], [self randomFloatingGenerator]); 
       } 
       completion:NULL]; 

randomFloatingGenerator生成-5之间的数字和5问题是，它仅执行一次，并保持着相同的随机值的重复。

EDIT1： 现在，我已经试过这

-(void)animationLoop{ 

[UIView animateWithDuration:1.0 
        animations: ^{ myCircleUIView.transform = CGAffineTransformMakeTranslation([self randomFloatingGenerator], [self randomFloatingGenerator]); } 
        completion: 
    ^(BOOL finished) { 
     [UIView animateWithDuration:1.0 
          animations:^{ myCircleUIView.transform = CGAffineTransformMakeTranslation(0,0); 
          } 
          completion: 
      ^(BOOL finished) {[self animationLoop];}]; 
    }]; 

但它仍然没有工作，在动画....嗳哟......我想我做了一些愚蠢的错误，我需要第二组眼睛帮助我。

EDIT2： 修正了它。

-(void)animationLoop{ 
    CGPoint oldPoint = CGPointMake(myCircleUIView.frame.origin.x, myCircleUIView.frame.origin.y); 
    [UIView animateWithDuration:1.0 
        animations: ^{ myCircleUIView.frame = CGRectMake(myCircleUIView.frame.origin.x + [self randomFloatingGenerator], myCircleUIView.frame.origin.y + [self randomFloatingGenerator], myCircleUIView.frame.size.width, myCircleUIView.frame.size.height); } 
        completion: 
    ^(BOOL finished) { 
     [UIView animateWithDuration:1.0 
          animations:^{ myCircleUIView.frame = CGRectMake(oldPoint.x, oldPoint.y, myCircleUIView.frame.size.width, myCircleUIView.frame.size.height);} 
          completion: 
      ^(BOOL finished) {[self animationLoop];}]; 
    }]; 
} 

感谢您的帮助。

EDIT 3：

有人张贴增强的代码。

Answer 1

@ Shamy的解决方案，改进，固定和CPU安全。

-(void)animateFloatView:(UIView*)view{ 

    // Abort the recursive loop 
    if (!view) 
     return; 

    CGPoint oldPoint = CGPointMake(view.frame.origin.x, view.frame.origin.y); 
    [UIView animateWithDuration:0.6 
        animations: ^{ view.frame = CGRectMake(view.frame.origin.x, view.frame.origin.y - 15, view.frame.size.width, view.frame.size.height); } 
        completion: 
    ^(BOOL finished) { 

     if (finished) { 
      [UIView animateWithDuration:0.6 
           animations:^{ view.frame = CGRectMake(oldPoint.x, oldPoint.y, view.frame.size.width, view.frame.size.height);} 
           completion: 
       ^(BOOL finished2) { 
        if(finished2) 
         [self animateFloatView:view]; 
       }]; 

     } 
    }]; 
} 

每当你想停止（离开视图控制器在必要时）的动画，拨打使用零功能，因为这样：

[self recursiveFloatingAnimation:nil]; 

不回采动画将导致递归循环无限运行并压倒CPU堆栈。

Answer 2

它会表现得那样。当你重复动画而不是函数。所以每次你第一次打电话时它都会重复同样的动画。这样做：

@interface AAViewController() 

@property (nonatomic, strong) UIView * floatingView; 
@end 

@implementation AAViewController 

- (void)viewDidLoad 
{ 
    [super viewDidLoad]; 
    // Do any additional setup after loading the view, typically from a nib. 
    _floatingView = [[UIView alloc] initWithFrame:CGRectMake(0, 0, 50, 50)]; 
    [_floatingView setBackgroundColor:[UIColor redColor]]; 
    [self.view addSubview:_floatingView]; 

    [self circleUIViewFloating]; 
} 

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

#pragma mark - Circle UIView floating 

- (void) circleUIViewFloating { 

    [UIView animateWithDuration:2.0 
        animations:^{ 
         _floatingView.transform = CGAffineTransformMakeTranslation([self randomFloatingGenerator : 270], [self randomFloatingGenerator:480]); 
        } completion:^(BOOL finished) { 
         [self circleUIViewFloating]; 
        }]; 
} 

- (int) randomFloatingGenerator : (int) max{ 
    return arc4random() % max; 
} 

这是complete running project为此。

Answer 3

-(void)animationLoop{ 
CGPoint oldPoint = CGPointMake(myCircleUIView.frame.origin.x, myCircleUIView.frame.origin.y); 
[UIView animateWithDuration:1.0 
       animations: ^{ myCircleUIView.frame = CGRectMake(myCircleUIView.frame.origin.x + [self randomFloatingGenerator], myCircleUIView.frame.origin.y + [self randomFloatingGenerator], myCircleUIView.frame.size.width, myCircleUIView.frame.size.height); } 
       completion: 
^(BOOL finished) { 
    [UIView animateWithDuration:1.0 
         animations:^{ myCircleUIView.frame = CGRectMake(oldPoint.x, oldPoint.y, myCircleUIView.frame.size.width, myCircleUIView.frame.size.height);} 
         completion: 
     ^(BOOL finished) {[self animationLoop];}]; 
}]; 
} 

Answer 4

雨燕2.1版本在这里：

func animateFloatView(view: UIView?) { 
    // Abort the recursive loop 
    guard let view = view else { return } 


    let oldPoint: CGPoint = CGPointMake(view.frame.origin.x, view.frame.origin.y) 
    UIView.animateWithDuration(0.6, animations: {() -> Void in 
     view.frame = CGRectMake(view.frame.origin.x, view.frame.origin.y - 15, view.frame.size.width, view.frame.size.height) 
     }, completion: {(finished: Bool) -> Void in 
      if finished { 
       UIView.animateWithDuration(0.6, animations: {() -> Void in 
        view.frame = CGRectMake(oldPoint.x, oldPoint.y, view.frame.size.width, view.frame.size.height) 
        }, completion: {(finished2: Bool) -> Void in 
         if finished2 { 
          self.animateFloatView(view) 
         } 
       }) 
      } 
    }) 
} 

Answer 5

雨燕3.1：

func animateFloatView(_ view: UIView?) { 
    guard let view = view else { return } 
    let oldYCoordinate = view.center.y 

    UIView.animate(withDuration: 0.6, animations: { 
     view.center.y -= 15 
    }, completion: { _ in 
     UIView.animate(withDuration: 0.6, animations: { 
      view.center.y = oldYCoordinate 
     }, completion: { _ in 
      self.animateFloatView(view) 
     }) 
    }) 
}