iOS 打开相册，保存图片到相册，打开相机

在开发过程中我们经常会用到相册与相机

下面我讲一下相册与相机的基本操作:

1. 打开相册
2. 保存图片到相册
3. 打开相机

1，打开相册

//1. 要遵循代理
<UINavigationControllerDelegate, UIImagePickerControllerDelegate>

//2. 自定义一个按钮
UIButton *btn = [UIButton buttonWithType:UIButtonTypeSystem];
[btn setTitle:@"打开相册" forState:UIControlStateNormal];
btn.frame = CGRectMake(100, 100, 100, 100);
[btn addTarget:self action:@selector(toQRCode:) forControlEvents:UIControlEventTouchUpInside];
[self.view addSubview:btn];

//3. 执行按钮的方法
- (void)toQRCode:(UIButton *)btn {

NSLog(@"打开相册");

UIImagePickerController *picker = [[UIImagePickerController alloc] init];
picker.delegate = self;
picker.allowsEditing = true;
[self presentViewController:picker animated:true completion:nil];
}

效果图：

2，保存图片到相册

// 1.
// 定义个全局 UIImageView
_imageView = [[UIImageView alloc] initWithImage:[UIImage imageNamed:@"logo"]];
_imageView.frame = CGRectMake(kScreen_Width/2-100, kScreen_Height/2-70, 200, 200);
[self.view addSubview:_imageView];

// 启动用户交互
_imageView.userInteractionEnabled = YES;

// 手势 长按
UILongPressGestureRecognizer *longAccording = [[UILongPressGestureRecognizer alloc] initWithTarget:self action:@selector(longAccordingAction:)];
[_imageView addGestureRecognizer:longAccording];

//2.
#pragma mark - 长按 执行的方法
- (void)longAccordingAction:(UILongPressGestureRecognizer *)sender {

NSLog(@"长按");
if (sender.state == UIGestureRecognizerStateBegan) {

// 定义个提示框
UIAlertController *alertController = [UIAlertController alertControllerWithTitle:@"是否要保存到相册" message:nil preferredStyle:UIAlertControllerStyleAlert];
UIAlertAction *action1 = [UIAlertAction actionWithTitle:@"取消" style:UIAlertActionStyleDefault handler:^(UIAlertAction * _Nonnull action) {

}];
[alertController addAction:action1];

UIAlertAction *action = [UIAlertAction actionWithTitle:@"OK" style:UIAlertActionStyleDefault handler:^(UIAlertAction * _Nonnull action) {

// 关键代码在这里
UIImageWriteToSavedPhotosAlbum(_imageView.image, self, @selector(image:didFinishSavingWithError:contextInfo:), NULL);

}];
[alertController addAction:action];

[self presentViewController:alertController animated:YES completion:^{

}];
}
}

//3.
#pragma mark - 保存图片成功后 回调一个方法
- (void)image:(UIImage *)image didFinishSavingWithError:(NSError *)error contextInfo:(void *)contextInfo;
{
NSString *msg=nil;
if (!error)
{
msg=@"保存成功";
}
else
{
msg=@"保存失败";
}
NSLog(@"%@",msg);
}

效果图：

3，打开相机

//1. 要遵循 <UINavigationControllerDelegate, UIImagePickerControllerDelegate>代理
//2. 自定义一个按钮
UIButton *btn = [UIButton buttonWithType:UIButtonTypeSystem];
[btn setTitle:@"打开相机" forState:UIControlStateNormal];
btn.frame = CGRectMake(100, 100, 100, 100);
[btn addTarget:self action:@selector(toQRCode:) forControlEvents:UIControlEventTouchUpInside];
[self.view addSubview:btn];

//3. 执行按钮的方法
- (void)toQRCode:(UIButton *)btn {

NSLog(@"打开相机");

UIImagePickerController *picker=[[UIImagePickerController alloc] init];
picker.sourceType=UIImagePickerControllerSourceTypeCamera;
picker.delegate=self;
picker.allowsEditing=YES;
[self presentViewController:picker animated:YES completion:nil];

}

要打开相机 只有真机才能实现

这里就不演示了 请见谅。

解决：调用系统相册、相机发现是英文状态。

第一中方法：在info.plist里面添加： Localizedresources

can be mixed YES

第二中方法：在info.plist里面添加：Localization

native development region China