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标题: ios - CAShapeLayer 动画 iOS7 的问题 [打印本页]

作者: 菜鸟教程小白    时间: 2022-12-12 17:03
标题: ios - CAShapeLayer 动画 iOS7 的问题

我一直在努力解决 iOS7 上的动画效果(8、9 效果很好),它涉及将圆角矩形收缩成圆形。得到这样的效果。

Desired Effect

但我在 iOS7 上尝试收缩圆圈时出现了一些失真。

Distorted Effect on iOS7

我的 View Controller 非常简单

- (void)viewDidLoad {
    [super viewDidLoad];
    // Do any additional setup after loading the view, typically from a nib.

    CAShapeLayer *layer = [CAShapeLayer layer];
    layer.fillColor = [UIColor blackColor].CGColor;
    layer.frame = CGRectMake(100, 100, 100, 100);
    layer.path = [UIBezierPath bezierPathWithRoundedRect:CGRectMake(0, 0, 100, 50) cornerRadius:25].CGPath;
    self.myLayer = layer;
    [self.view.layer addSublayer:layer];

}


- (void)viewDidAppearBOOL)animated {
    [super viewDidAppear:animated];

    CAKeyframeAnimation *animation = [CAKeyframeAnimation animationWithKeyPath"path"];
    animation.values = @[
                         (id)[UIBezierPath bezierPathWithRoundedRect:CGRectMake(0, 0, 100, 50) cornerRadius:25].CGPath,
                         (id)[UIBezierPath bezierPathWithRoundedRect:CGRectMake(5, 0, 90, 50) cornerRadius:25].CGPath,
                         (id)[UIBezierPath bezierPathWithRoundedRect:CGRectMake(10, 0, 80, 50) cornerRadius:25].CGPath,
                         (id)[UIBezierPath bezierPathWithRoundedRect:CGRectMake(15, 0, 70, 50) cornerRadius:25].CGPath,
                         (id)[UIBezierPath bezierPathWithRoundedRect:CGRectMake(20, 0, 60, 50) cornerRadius:25].CGPath,
                         (id)[UIBezierPath bezierPathWithRoundedRect:CGRectMake(25, 0, 50, 50) cornerRadius:25].CGPath,
                         ];

    animation.keyTimes = @[@(0),
                           @(0.18),
                           @(0.36),
                           @(0.54),
                           @(0.72),
                           @(1),
                           ];

    animation.duration = 10;
    animation.fillMode = kCAFillModeForwards;
    [self.myLayer addAnimation:animation forKey:nil];
    self.myLayer.path = [UIBezierPath bezierPathWithRoundedRect:CGRectMake(25, 0, 50, 50) cornerRadius:25].CGPath;
}



Best Answer-推荐答案


这似乎是 iOS 7 的一个错误。查看此链接:

http://www.paintcodeapp.com/blogpost/code-for-ios-7-rounded-rectangles

帖子底部有一个类别方法可以解决此问题。 我用你的代码测试了它,它似乎工作!我不得不做一个小改动,那就是替换

CGFloat limitedRadius = MIN(radius, limit);

CGFloat limitedRadius = radius;

这使得拐角半径变得足够大以创建一个圆。可能值得调查一下为什么拐角半径一开始就受到限制,但我会把它留给你

关于ios - CAShapeLayer 动画 iOS7 的问题,我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/33648955/






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