创建类似于UIAlertView演示的Pop动画

Question

我想以与UIAlertView相同的方式呈现一个视图 - 一个流行/弹簧.不幸的是,子类化UIAlertView不是我需要呈现的视图的选项.我已经写了一些代码,但我似乎无法像我想的那样实现它.如果有任何相似之处(我在Google上找不到任何内容),我将不胜感激任何有关更大现实主义或链接的建议.谢谢.

  - (id)initWithFrame:(CGRect)frame {
    if ((self = [super initWithFrame:frame])) {

        self.backgroundColor = [UIColor whiteColor];

        v = [[UIView alloc] initWithFrame:CGRectMake(140, 140, 60, 60)];
        v.backgroundColor = [UIColor blueColor];

        [self addSubview:v];
        [self animate];

    }
    return self;
}

- (void)animate {

    [UIView beginAnimations:nil context:NULL];
    [UIView setAnimationCurve:UIViewAnimationCurveLinear];
    [UIView setAnimationDuration:0.2];
    [UIView setAnimationDelegate:self];
    [UIView setAnimationDidStopSelector:@selector(popStep1Complete)];
    v.frame = CGRectMake(90, 90, 140, 140);
    [UIView commitAnimations];
}

- (void)popStep1Complete {

    [UIView beginAnimations:nil context:NULL];
    [UIView setAnimationCurve:UIViewAnimationCurveLinear];
    [UIView setAnimationDuration:0.15];
    [UIView setAnimationDelegate:self];
    [UIView setAnimationDidStopSelector:@selector(popStep2Complete)];
    v.frame = CGRectMake(110, 110, 100, 100);
    [UIView commitAnimations];
}

- (void)popStep2Complete {

    [UIView beginAnimations:nil context:NULL];
    [UIView setAnimationCurve:UIViewAnimationCurveLinear];
    [UIView setAnimationDuration:0.15];
    v.frame = CGRectMake(100, 100, 120, 120);
    [UIView commitAnimations];
}

Answer 1

- (void) attachPopUpAnimation
{
    CAKeyframeAnimation *animation = [CAKeyframeAnimation
        animationWithKeyPath:@"transform"];

    CATransform3D scale1 = CATransform3DMakeScale(0.5, 0.5, 1);
    CATransform3D scale2 = CATransform3DMakeScale(1.2, 1.2, 1);
    CATransform3D scale3 = CATransform3DMakeScale(0.9, 0.9, 1);
    CATransform3D scale4 = CATransform3DMakeScale(1.0, 1.0, 1);

    NSArray *frameValues = [NSArray arrayWithObjects:
        [NSValue valueWithCATransform3D:scale1],
        [NSValue valueWithCATransform3D:scale2],
        [NSValue valueWithCATransform3D:scale3],
        [NSValue valueWithCATransform3D:scale4],
        nil];
    [animation setValues:frameValues];

    NSArray *frameTimes = [NSArray arrayWithObjects:
        [NSNumber numberWithFloat:0.0],
        [NSNumber numberWithFloat:0.5],
        [NSNumber numberWithFloat:0.9],
        [NSNumber numberWithFloat:1.0],
        nil];    
    [animation setKeyTimes:frameTimes];

    animation.fillMode = kCAFillModeForwards;
    animation.removedOnCompletion = NO;
    animation.duration = .2;

    [self.layer addAnimation:animation forKey:@"popup"];
}

Answer 2

指向delackner帖子的指针也是我发现的最好的初始值.我只会为那些试图真正模仿UIAlertView的人提供一些东西:

1. 添加圆角边,边框和半透明图层颜色
2. 一些alpha淡入/淡出,和
3. 使用最新的iOS工具链对块进行重做更简洁
4. 我也发现最初的1.1横向扩展,他建议太大,在大多数情况下,1.05在视觉上看起来更正确

码:

self.layer.cornerRadius = 10.0;
[self.layer setMasksToBounds:YES];
self.layer.backgroundColor = [[UIColor blueColor] colorWithAlphaComponent:0.60].CGColor;
self.layer.borderColor = [UIColor whiteColor].CGColor;
self.layer.borderWidth = 1.1;
if (self.hidden == YES) { // swoop in if coming from hidden, otherwise pulse in-place
  self.transform = CGAffineTransformMakeScale(0.6, 0.6);
}
self.hidden = NO;
[UIView animateWithDuration:0.2
                 animations:^{
                   self.transform = CGAffineTransformMakeScale(1.05, 1.05);
                   self.alpha = 0.8;
                 }
                 completion:^(BOOL finished){
                   [UIView animateWithDuration:1/15.0
                                    animations:^{
                                      self.transform = CGAffineTransformMakeScale(0.9, 0.9);
                                      self.alpha = 0.9;
                                    }
                                    completion:^(BOOL finished) {
                                      [UIView animateWithDuration:1/7.5
                                                       animations:^{
                                                         self.transform = CGAffineTransformIdentity;                                                             
                                                         self.alpha = 1.0;
                                                       }
                                       ];
                                    }
                    ];
                 }
 ];

Answer 3

有一件事:如果您使用多个CAKeyframeAnimationUIView排队动画而不是多个UIView排队动画,那么这样的多步动画就会容易得多.