最近的项目中运用到了这两个功能，所以记录一下。做了一个小工程将两个方法结合到了一起

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- (void)viewDidLoad {    [super viewDidLoad];    UIButton * btn = [UIButton buttonWithType:UIButtonTypeContactAdd];    btn.frame =CGRectMake(30, 30, 30, 30);    [self.view addSubview:btn];    [btn addTarget:self action:@selector(btnClick:) forControlEvents:UIControlEventTouchUpInside];}-(void)btnClick:(UIButton *)sender{    [self savePhoto];}// 保存图片到相册功能，ALAssetsLibraryiOS9.0 以后用photoliabary 替代，-(void)savePhoto{    UIImage * image = [self captureImageFromView:self.view];    ALAssetsLibrary * library = [ALAssetsLibrary new];    NSData * data = UIImageJPEGRepresentation(image, 1.0);    [library writeImageDataToSavedPhotosAlbum:data metadata:nil completionBlock:nil];}//截图功能-(UIImage *)captureImageFromView:(UIView *)view{    CGRect screenRect = [view bounds];    UIGraphicsBeginImageContext(screenRect.size);    CGContextRef ctx = UIGraphicsGetCurrentContext();    [view.layer renderInContext:ctx];    UIImage * image = UIGraphicsGetImageFromCurrentImageContext();    UIGraphicsEndImageContext();    return image;}