iOS实现图片存在本地、再从本地获取图片的功能

//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;}