1.保存到iOS照片库需要引入QuartzCore.framework框架，具体代码如下：
.h文件
#import <QuartzCore/QuartzCore.h>
UIImageView *imageView;
@property (nonatomic, retain) IBOutlet UIImageView *imageView;
.m文件
UIGraphicsBeginImageCont
ext(imageView.bounds.size);
[imageView.layer renderInContext:UIGraphicsGetCurrentCont
ext()];
UIImage *temp = UIGraphicsGetImageFromCu
rrentImageContext();
UIGraphicsEndImageContex
t();
UIImageWriteToSavedPhoto
sAlbum(temp, nil, nil, nil);
2.保存到对应的沙盒目录中，具体代码如下：
NSArray *paths = NSSearchPathForDirectori
esInDomains(NSDocumentDirectory,NSUserDomainMask, YES);
NSString *filePath = [[paths objectAtIndex:0] stringByAppendingPathCom
ponent:[NSString stringWithFormat:@"sms.gif"]];
// 保存文件的名称
BOOL result = [UIImagePNGRepresentation
(imageView.image)writeToFile: filePath
atomically:YES]; // 保存成功会返回YES