iOS---如何截图，如何将图片保存到相册

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 

-(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;

}