UIImage存为本地文件，UIImage转换为NSData
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UIImage *m_imgFore=......;
//png格式
NSData *imagedata=UIImagePNGRepresentation(m_imgFore);
//JEPG格式
//NSData?*imagedata=UIImageJEPGRepresentation(m_imgFore,1.0);
NSArray *paths=NSSearchPathForDirectoriesInDomains(NSDocumentDirectory,NSUserDomainMask,YES);
NSString *documentsDirectory=[paths objectAtIndex:0];?
NSString *savedImagePath=[documentsDirectory stringByAppendingPathComponent:@"saveFore.png"];
[imagedata writeToFile:savedImagePath atomically:YES];
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本地默认存放路径：
Finder---位置----app(用户名)---application support---iphone Sinulator---4.3---Applications--模拟器--
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