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-(UIImage*)convertViewToImage:(UIView*)v{ CGSize
s = v.bounds.size; UIGraphicsBeginImageContext(s); [v.layer
renderInContext:UIGraphicsGetCurrentContext()]; UIImage*image
= UIGraphicsGetImageFromCurrentImageContext(); UIGraphicsEndImageContext(); returnimage;} |
因此推測，这种方法适用于iPhone4之前的机型。iPhone4后，因为採用了Retain高清屏，在转换时须要依据屏幕密度做个处理，又到到以下的答案:
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-(UIImage*)convertViewToImage:(UIView*)v{ CGSize
s = v.bounds.size; UIGraphicsBeginImageContextWithOptions(s,NO,
v.layer.contentsScale); [v.layer
renderInContext:UIGraphicsGetCurrentContext()]; UIImage*image
= UIGraphicsGetImageFromCurrentImageContext(); UIGraphicsEndImageContext(); returnimage;} |
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-(UIImage*)convertViewToImage:(UIView*)v{ CGSize
s = v.bounds.size; //
以下方法，第一个參数表示区域大小。第二个參数表示是否是非透明的。
UIGraphicsBeginImageContextWithOptions(s,NO,
[UIScreen mainScreen].scale); [v.layer
renderInContext:UIGraphicsGetCurrentContext()]; UIImage*image
= UIGraphicsGetImageFromCurrentImageContext(); UIGraphicsEndImageContext(); returnimage;} |
原文：http://www.cnblogs.com/slgkaifa/p/6741745.html