1. 保存

- (void)saveImage:(UIImage*)image {

NSArray*paths =NSSearchPathForDirectoriesInDomains(NSDocumentDirectory,NSUserDomainMask,YES);NSString*filePath = [[paths objectAtIndex:0]stringByAppendingPathComponent:[NSStringstringWithFormat:@"demo.png"]];// 保存文件的名称

BOOLresult =[UIImagePNGRepresentation(image)writeToFile:filePath  atomically:YES];// 保存成功会返回YES

if(result ==YES) {

    NSLog(@"保存成功");

 }

}

2取出保存的图片

- (void)getImage {

NSArray*paths =NSSearchPathForDirectoriesInDomains(NSDocumentDirectory,NSUserDomainMask,YES);NSString*filePath = [[paths objectAtIndex:0]stringByAppendingPathComponent:[NSStringstringWithFormat:@"demo.png"]];

// 保存文件的名称

UIImage*img = [UIImageimageWithContentsOfFile:filePath];

NSLog(@"=== %@", img);

}