创建UIImageView
创建UIImageView
是为了将照片展示出来,我们是要把UIImage
保存到系统相册(Photo Album):
#define SCREEN [UIScreen mainScreen].bounds.size
self.image = [UIImage imageNamed:@"iOSDevTip"];
UIImageView *imageView = [[UIImageView alloc] initWithFrame:CGRectMake((SCREEN.width - 300) / 2, 70, 300, 150)];
imageView.image = self.image;
[self.view addSubview:imageView];
创建UIButton
创建UIButton
并绑定actionClick:
事件:
UIButton *button = [[UIButton alloc] init];
button.frame = CGRectMake( 100, 300, SCREEN.width - 200, 40);
[button addTarget:self action:@selector(actionClick:) forControlEvents:UIControlEventTouchUpInside];
[button setTitleColor:[UIColor blueColor] forState:UIControlStateNormal];
[button setBackgroundColor:[UIColor orangeColor]];
[button setTitle:@"SavePhoto" forState:UIControlStateNormal];
[self.view addSubview:button];
- (void)actionClick:(UIButton *)button
{
}
保存照片到系统相册(Photo Album)
在actionClick:
方法里调用:
UIImageWriteToSavedPhotosAlbum(self.image, self, @selector(image:didFinishSavingWithError:contextInfo:), NULL);
这个时候,我们想知道保存是否成功,所以需要制定回调方法
// 指定回调方法
- (void)image:(UIImage *)image didFinishSavingWithError:(NSError *)error contextInfo:(void *)contextInfo
{
if(!error){
NSLog(@"save success");
}else{
NSLog(@"save failed");
}
}
在这个方法里,我们就知道照片是否保存成功。然后,根据需求来刷新UI线程。用户第一次使用APP的时候,点击SavePhoto
按钮的时候,系统会询问权限:
Demo地址:iOSStrongDemo 下一篇文章,将会讲如何创建自己的相册并保存照片。