一、
这个简单的键-值对添加到您的Info.plist:UIViewEdgeAntialiasing设置为YES。但是这样容易出现性能问题。
二、
对单个 Layer 开启抗锯齿的方法, imageView.layer.allowsEdgeAntialiasing = YES; //>=ios7
三、
image的category
- (UIImage *)antiAlias { CGFloat border = 1.0f; CGRect rect = CGRectMake(border, border, self.size.width-2*border, self.size.height-2*border); UIImage *img = nil; UIGraphicsBeginImageContext(CGSizeMake(rect.size.width,rect.size.height)); [self drawInRect:CGRectMake(-1, -1, self.size.width, self.size.height)]; img = UIGraphicsGetImageFromCurrentImageContext(); UIGraphicsEndImageContext(); UIGraphicsBeginImageContext(self.size); [img drawInRect:rect]; UIImage* antiImage = UIGraphicsGetImageFromCurrentImageContext(); UIGraphicsEndImageContext(); return antiImage; }
缺点是显示出来会比原来小那么一点点(我的做法是直接cut掉1px的边 当然你也可以直接在图像外面加1px的透明边)
我测试了下,二三方法在xcode7,ios9.2效果基本一样。
参考:
http://adad184.com/2015/08/31/image-rotate-with-antialiasing/