标签:UIAlertAction 相册 NSLog iOS 相机 UIImagePickerController imagePicker
在大部分app中,都是会使用到调用相机和相册的,所以学习app开发就必须要学习一下调用相机和相册。
首先要先了解一下UIImagePickerController。
一、UIImagePickerController
UIImagePickerController
是iOS系统提供的和系统的相册和相机交互的一个类,可以用来获取相册的照片,也可以调用系统的相机拍摄照片或者视频。该类的继承结构是:
UIImagePickerController–>UINavigationController–>UIViewController–>UIResponder–>NSObject
二、具体操作
调用相机时:
//访问相机操作
- (void)visitCamera {
UIAlertController* alert = [UIAlertController alertControllerWithTitle:@"提示" message:@"该app正在请求您的拍摄权限,是否同意?" preferredStyle:UIAlertControllerStyleAlert];
UIAlertAction *okAction = [UIAlertAction actionWithTitle:@"是" style:UIAlertActionStyleDefault handler:^(UIAlertAction * _Nonnull action) {
UIImagePickerController* imagePicker = [[UIImagePickerController alloc] init];
BOOL isCamera = [UIImagePickerController isCameraDeviceAvailable:UIImagePickerControllerCameraDeviceFront]; //判断相机可不可用
if (!isCamera) {
NSLog(@"没有摄像头");
return;
}
imagePicker.delegate = self; //设置代理
imagePicker.sourceType = UIImagePickerControllerSourceTypeCamera; //数据来源于相机
imagePicker.allowsEditing = YES;
NSLog(@"=======确认使用相机========");
}];
UIAlertAction *cancelAction = [UIAlertAction actionWithTitle:@"否" style:UIAlertActionStyleCancel handler:^(UIAlertAction * _Nonnull action) {
NSLog(@"=======取消使用相机======");
}];
[alert addAction:okAction];
[alert addAction:cancelAction];
[self presentViewController:alert animated:YES completion:nil];
}
相机的类型:
typedef NS_ENUM(NSInteger, UIImagePickerControllerCameraDevice) {
UIImagePickerControllerCameraDeviceRear, //后置摄像头
UIImagePickerControllerCameraDeviceFront //前置摄像头
}
调用相册
//访问相册
- (void)visitPhoto {
UIAlertController* alert = [UIAlertController alertControllerWithTitle:@"提示" message:@"该app正在请求访问您的相册,是否同意访问?" preferredStyle:UIAlertControllerStyleAlert];
[self presentViewController:alert animated:YES completion:nil];
UIAlertAction *okAction = [UIAlertAction actionWithTitle:@"是" style:UIAlertActionStyleDefault handler:^(UIAlertAction * _Nonnull action) {
UIImagePickerController* imagePicker = [[UIImagePickerController alloc] init];
[self presentViewController:imagePicker animated:YES completion:nil];
imagePicker.delegate = self;
imagePicker.sourceType = UIImagePickerControllerSourceTypePhotoLibrary; //数据来源于相册
NSLog(@"=======确认访问相册========");
}];
UIAlertAction *cancelAction = [UIAlertAction actionWithTitle:@"否" style:UIAlertActionStyleCancel handler:^(UIAlertAction * _Nonnull action) {
NSLog(@"=======取消访问相册======");
}];
[alert addAction:okAction];
[alert addAction:cancelAction];
}
UIImagePickerController
数据来源:
typedef NS_ENUM(NSInteger, UIImagePickerControllerSourceType) {
UIImagePickerControllerSourceTypePhotoLibrary, //来源于相册
UIImagePickerControllerSourceTypeCamera, //相机
UIImagePickerControllerSourceTypeSavedPhotosAlbum //系统照片应用的照片,包含用设备拍摄的所有照片流
}
选取图片后的回调:
//访问相册后的回调
- (void)imagePickerController:(UIImagePickerController *)picker didFinishPickingMediaWithInfo:(NSDictionary*)info {
NSLog(@"========所选图片信息=======\n");
NSLog(@"%@", info);
UIImage* image = [info objectForKey:UIImagePickerControllerOriginalImage]; //UIImagePickerControllerOriginalImage 图片可以编辑
self.imageView.image = image;
[picker dismissViewControllerAnimated:YES completion:^{
NSLog(@"图片上传成功!");
}];
}
效果:
标签:UIAlertAction,相册,NSLog,iOS,相机,UIImagePickerController,imagePicker 来源: https://blog.csdn.net/weixin_50990189/article/details/121583647
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