屏幕截图将图片 保存到相册

//屏幕截图

{

[super viewDidLoad];

// Do any additional setup after loading the view.

//首先先设定截取图片的大小

CGSize size = CGSizeMake(200, 600);

该函数的功能同UIGraphicsBeginImageContextWithOptions的功能相同，相当与UIGraphicsBeginImageContextWithOptions的opaque参数为NO,scale因子为1.0。

UIGraphicsBeginImageContextWithOptions(size, YES, 1);

[self.view.layer renderInContext:UIGraphicsGetCurrentContext()];

self.image = UIGraphicsGetImageFromCurrentImageContext();

//UIImageWriteToSavedPhotosAlbum(img, self, nil, nil);

UIGraphicsEndImageContext();

self.imageView = [[UIImageView alloc] initWithFrame:CGRectMake(60, 100, 200, 300)];

_imageView.image =self.image;

_imageView.userInteractionEnabled = YES;

[self.view addSubview:_imageView];

UITapGestureRecognizer *tapGesture = [[UITapGestureRecognizer alloc] init];

tapGesture.numberOfTapsRequired = 1;

tapGesture.numberOfTouchesRequired = 1;

[tapGesture addTarget:self action:@selector(tapSaveImageToIphone)];

[self.imageView addGestureRecognizer:tapGesture];

}

- (void)tapSaveImageToIphone{

/**

*  将图片保存到iPhone本地相册

*  UIImage *image            图片对象

*  id completionTarget      响应方法对象

*  SEL completionSelector    方法

*  void *contextInfo

*/

UIImageWriteToSavedPhotosAlbum(self.imageView.image, self, @selector(image:didFinishSavingWithError:contextInfo:), nil);

}

- (void)image:(UIImage *)image didFinishSavingWithError:(NSError *)error contextInfo:(voidvoid *)contextInfo{

if(error == nil) {

UIAlertView *alert = [[UIAlertView alloc] initWithTitle:@"提示"message:@"已存入手机相册"delegate:self cancelButtonTitle:nil otherButtonTitles:@"确定", nil nil];

[alert show];

}else{

UIAlertView *alert = [[UIAlertView alloc] initWithTitle:@"提示"message:@"保存失败"delegate:self cancelButtonTitle:nil otherButtonTitles:@"确定", nil nil];

[alert show];

}

}