iOS image-图片设置圆角实质上是重绘图片
此代码用于实现UIImage圆角,而不是UIImageView圆角,UIImageView圆角可以直接通过如下实现 imageView.layer.cornerRadius = radius; imageView.layer.masksToBounds = YES;
//方法1- (UIImage *)imageWithRoundedCornersSize:(float)cornerRadius usingImage:(UIImage *)original{ CGRect frame = CGRectMake(0, 0, original.size.width, original.size.height); // Begin a new image that will be the new image with the rounded corners // (here with the size of an UIImageView) UIGraphicsBeginImageContextWithOptions(original.size, NO, 1.0); // Add a clip before drawing anything, in the shape of an rounded rect [[UIBezierPath bezierPathWithRoundedRect:frame cornerRadius:cornerRadius] addClip]; // Draw your image [original drawInRect:frame]; // Retrieve and return the new image UIImage *image = UIGraphicsGetImageFromCurrentImageContext(); UIGraphicsEndImageContext(); return image;}//方法2-(UIImage *)makeRoundedImage:(UIImage *) image radius: (float) radius;{ CALayer *imageLayer = [CALayer layer]; imageLayer.frame = CGRectMake(0, 0, image.size.width, image.size.height); imageLayer.contents = (id) image.CGImage; imageLayer.masksToBounds = YES; imageLayer.cornerRadius = radius; UIGraphicsBeginImageContext(image.size); [imageLayer renderInContext:UIGraphicsGetCurrentContext()]; UIImage *roundedImage = UIGraphicsGetImageFromCurrentImageContext(); UIGraphicsEndImageContext(); return roundedImage;} |
本文介绍了如何使用Swift实现UIImage的圆角效果,包括通过直接修改UIImageView的属性和自定义方法两种方式。详细解释了每种方法的工作原理,并提供了代码示例。
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