iOS BUG UIView转UIImage模糊失真

##UIView转成Image

- (UIImage *)capture {UIGraphicsBeginImageContextWithOptions(self.bounds.size, YES, 0.0);[self.layer renderInContext:UIGraphicsGetCurrentContext()];UIImage *img = UIGraphicsGetImageFromCurrentImageContext();UIGraphicsEndImageContext();return img;
}

运行后发现，转换后的UIImage显示后会变模糊失真

##解决方案

- (UIImage *)capture {CGSize s = self .bounds.size;// 下面方法，第一个参数表示区域大小。第二个参数表示是否是非透明的。如果需要显示半透明效果，需要传NO，否则传YES。第三个参数就是屏幕密度了UIGraphicsBeginImageContextWithOptions(s, NO, [UIScreen mainScreen].scale);[self.layer renderInContext:UIGraphicsGetCurrentContext()];UIImage*image = UIGraphicsGetImageFromCurrentImageContext();UIGraphicsEndImageContext();return image;
}

##UIScrollView内容转成UIIMageView方法

- (UIImage *)captureScrollView:(UIScrollView *)scrollView
{UIImage* image = nil;UIGraphicsBeginImageContextWithOptions(scrollView.contentSize, NO, 0.0);{CGPoint savedContentOffset = scrollView.contentOffset;CGRect savedFrame = scrollView.frame;scrollView.contentOffset = CGPointZero;scrollView.frame = CGRectMake(0, 0, scrollView.contentSize.width, scrollView.contentSize.height);[scrollView.layer renderInContext: UIGraphicsGetCurrentContext()];image = UIGraphicsGetImageFromCurrentImageContext();scrollView.contentOffset = savedContentOffset;scrollView.frame = savedFrame;}UIGraphicsEndImageContext();if (image != nil) {return image;}return nil;
}

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