ios - 如何自定义矩形进度条？

Question

我想用 UIKIT 像吸引图像一样自定义一个矩形进度条。有没有源代码？Cocos2d 与 CCProgressTimer 相同，但我找不到任何 UIKIT 源代码。

Answer 1

创建一个ShapedLayer

CAShapeLayer *layer = [CAShapeLayer layer];
[layer setStrokeColor:[UIColor greenColor].CGColor];
[layer setLineWidth:10.0f];

[layer setFillColor:[UIColor clearColor].CGColor];

在你想要动画的地方用radious创建一个rect

UIBezierPath *path = [UIBezierPath bezierPathWithRoundedRect:CGRectMake(10, 10, 300, 200) cornerRadius:10.0f];
layer.path = path.CGPath;

CABasicAnimation *animation = [CABasicAnimation animationWithKeyPath:@"strokeEnd"];
animation.fromValue = [NSNumber numberWithFloat:0.0f];
animation.toValue = [NSNumber numberWithFloat:1.0f];

定义动画持续时间

animation.duration = 4.0f;
[layer addAnimation:animation forKey:@"myStroke"];

在要显示的图层上添加动画

[self.view.layer addSublayer:layer];