iOS UIImage生成高性能圆角图片
2019-03-13 本文已影响0人
魔力双鱼
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(void)imageWihtSize:(CGSize)size radius:(CGFloat)radius backColor:(UIColor *)backColor completion:(void(^)(UIImage *image))completion{
// 异步绘制裁切
dispatch_async(dispatch_get_global_queue(0, 0), ^{
// 利用绘图建立上下文
UIGraphicsBeginImageContextWithOptions(size, true, 0);
CGRect rect = CGRectMake(0, 0, size.width, size.height);
// 填充颜色
[backColor setFill];
UIRectFill(rect);
// 贝塞尔裁切
UIBezierPath *path = [UIBezierPath bezierPathWithRoundedRect:rect cornerRadius:radius];
[path addClip];
[self drawInRect:rect];// 获取结果 UIImage *resultImage = UIGraphicsGetImageFromCurrentImageContext(); // 关闭上下文 UIGraphicsEndImageContext(); // 主队列回调 dispatch_async(dispatch_get_main_queue(), ^{ completion(resultImage); });});
}
