使用UIBezierPath、CAShapeLayer设置带边框圆角，内存占用最小且渲染快速，避免了离屏渲染带来的性能损耗，不多说，看代码
//任意圆角 带边框大小颜色 ； 当设置borderWidth为0 或者borderColor为透明色 移除layer
- (void)shapeLayerCornerRadiusWithRectCorner:(UIRectCorner)rectCorner cornerRadius:(CGFloat)cornerRadius borderColor:(UIColor*)borderColor borderWidth:(CGFloat)borderWidth {
//使用UIBezierPath 和 CAShapeLayer 设置圆角 内存占用最小且渲染快速
if (cornerRadius==0) {
[self shapeLayerCornerRadiusWithRectCorner:rectCorner];
return;
}
UIBezierPath *maskPath = [UIBezierPath bezierPathWithRoundedRect:self.bounds cornerRadius:cornerRadius];
CAShapeLayer *maskLayer = [[CAShapeLayer alloc]init];
//设置大小
maskLayer.frame = self.bounds;
//设置图形样子
maskLayer.path = maskPath.CGPath;
//设置边框大小颜色 中间透明
maskLayer.strokeColor = borderColor.CGColor;
maskLayer.lineWidth = borderWidth;
maskLayer.fillColor = [UIColor clearColor].CGColor;
//当设置borderWidth为0 或者borderColor为透明色 移除
if (borderWidth == 0 || borderColor == UIColor.clearColor) {
NSArray<CALayer *> *subLayers = self.layer.sublayers;
NSArray<CALayer *> *removedLayers = [subLayers filteredArrayUsingPredicate:[NSPredicate predicateWithBlock:^BOOL(id _Nullable evaluatedObject, NSDictionary<NSString *,id> * _Nullable bindings) {
return [evaluatedObject isKindOfClass:[CAShapeLayer class]];
}]];
[removedLayers enumerateObjectsUsingBlock:^(CALayer * _Nonnull obj, NSUInteger idx, BOOL * _Nonnull stop) {
[obj removeFromSuperlayer];
}];
}else{
[self.layer insertSublayer:maskLayer atIndex:0];
}
}
