关于CAShapeLayer的一些基本操作
设置圆形进度条:
实现效果如下:
实现代码如下:(注释很详细啦!!!)
1 UIView *circleView = [[UIView alloc]initWithFrame:CGRectMake(40, 200, 100, 100)]; 2 shapeView.backgroundColor = [UIColor greenColor]; 3 [self.view addSubview:circleView]; 4 5 // 实现圆形进度条 6 7 CAShapeLayer *shapeLayer =[CAShapeLayer layer]; 8 shapeLayer.frame = circleView.bounds; 9 //绘制 10 UIBezierPath *path = [UIBezierPath bezierPathWithOvalInRect:circleView.bounds]; 11 shapeLayer.path = path.CGPath; 12 // 设置填充颜色 13 shapeLayer.fillColor = [UIColor greenColor].CGColor; 14 // 设置线条宽度 15 shapeLayer.lineWidth = 2.0f; 16 // 设置线条颜色 17 shapeLayer.strokeColor = [UIColor redColor].CGColor; 18 [circleView.layer addSublayer:shapeLayer]; 19 20 // 设置基础动画 21 CABasicAnimation *pathAnimation = [CABasicAnimation animationWithKeyPath:@"strokeEnd"]; 22 pathAnimation.duration = 3.0; 23 pathAnimation.timingFunction = [CAMediaTimingFunction functionWithName:kCAMediaTimingFunctionEaseInEaseOut]; 24 pathAnimation.fromValue = [NSNumber numberWithFloat:0.0f]; 25 pathAnimation.toValue = [NSNumber numberWithFloat:1.0f]; 26 pathAnimation.fillMode = kCAFillModeForwards; 27 pathAnimation.removedOnCompletion = NO; 28 [shapeLayer addAnimation:pathAnimation forKey:@"strokeEndAnimation"]; 29
最后记录一个警告的意思和处理方法:
如果出现上面的这警告问题,原因是:
这个往往是复制网上的带格式的代码导致的。
解决办法:
在提示的地方进行换行处理,首先先选中提示的"_".然后按回车键即可。
最好的方法还是自己敲代码比较合适,不复制就不会出现这些警告啦!!!!
