iOS实现图片存在本地、再从本地获取图片的功能，代码如下：

//将图片保存到本地
+ (void)SaveImageToLocal:(UIImage*)image Keys:(NSString*)key {
 NSUserDefaults* preferences = [NSUserDefaults standardUserDefaults];
 //[preferences persistentDomainForName:LocalPath];
 [preferences setObject:UIImagePNGRepresentation(image) forKey:key];
}
 
//本地是否有相关图片
+ (BOOL)LocalHaveImage:(NSString*)key {
 NSUserDefaults* preferences = [NSUserDefaults standardUserDefaults];
 //[preferences persistentDomainForName:LocalPath];
 NSData* imageData = [preferences objectForKey:key];
 if (imageData) {
  return YES;
 }
 return NO;
}
 
//从本地获取图片
+ (UIImage*)GetImageFromLocal:(NSString*)key {
 NSUserDefaults* preferences = [NSUserDefaults standardUserDefaults];
 //[preferences persistentDomainForName:LocalPath];
 NSData* imageData = [preferences objectForKey:key];
 UIImage* image;
 if (imageData) {
  image = [UIImage imageWithData:imageData];
 }
 else {
  NSLog(@"未从本地获得图片");
 }
 return image;
}

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