1.
#import <PhotosUI/PhotosUI.h>
Info.plist 中设置
“PHPhotoLibraryPreventAutomaticLimitedAccessAlert”的值为 YES 来阻止该弹窗反复弹出
2.iOS14之后获取相册授权状态的方法
if (@available(iOS 14, *)) {
[PHPhotoLibrary requestAuthorizationForAccessLevel:PHAccessLevelReadWrite handler:^(PHAuthorizationStatus status) {
dispatch_async(dispatch_get_main_queue(), ^{
///用户已授权此应用程序有限的照片库访问权限
if (status == PHAuthorizationStatusLimited) {
}else{
}
});
}];
}
3.第一种使用方法，和QQ一样，推荐使用
不在 Info.plist 阻止弹窗弹出， 使用监听获取回调
1. 实现PHPhotoLibraryChangeObserver
@interface AddWatermarkViewController ()<PHPhotoLibraryChangeObserver>
2. 注册监听
- (void)viewDidLoad {
[super viewDidLoad];
[[PHPhotoLibrary sharedPhotoLibrary] registerChangeObserver:self];
}
/// PHPhotoLibrary监听: 选择图片之后的回调
#pragma mark- PHPhotoLibraryChangeObserver
- (void)photoLibraryDidChange:(PHChange *)changeInstance{
///一定要在主线程刷新：这里是异步监听
dispatch_async (dispatch_get_main_queue (), ^{
[self reloadSelectedAssetCollection:nil];
});
}
4. 注销监听
- (void)viewWillDisappear:(BOOL)animated{
[super viewWillDisappear:animated];
[[PHPhotoLibrary sharedPhotoLibrary] unregisterChangeObserver:self];
}
2.自定义控制器，此方法选了之后去 设置中查看， 还是没效果。。 原因待查
1. 设置代理 PHPickerViewControllerDelegate
@interface AddWatermarkViewController ()< PHPickerViewControllerDelegate>
2.手动显示弹窗
- (void)showAlert{
@WeakObj(self);
if (@available(iOS 14, *)) {
///14之后想着授权状态方法：异步的
[PHPhotoLibrary requestAuthorizationForAccessLevel:PHAccessLevelReadWrite handler:^(PHAuthorizationStatus status) {
dispatch_async(dispatch_get_main_queue(), ^{
@StrongObj(self);
if (status == PHAuthorizationStatusLimited) {
PHPickerConfiguration *configuration = [[PHPickerConfiguration alloc] init];
configuration.filter = [PHPickerFilter imagesFilter]; // 可配置查询用户相册中文件的类型，支持三种 imagesFilter 表示 只显示图片
configuration.selectionLimit = 0; // 默认为1，为0时表示可多选。
PHPickerViewController *picker = [[PHPickerViewController alloc] initWithConfiguration:configuration];
picker.delegate = self;
[self presentViewController:picker animated:YES completion:nil];
}
});
}];
}
}
//点击取消或者完成的回调
- (void)picker:(PHPickerViewController *)picker didFinishPicking:(NSArray<PHPickerResult *> *)results
API_AVAILABLE(ios(14)){
[picker dismissViewControllerAnimated:YES completion:nil];
if (!results || !results.count) {
return;
}
[self reloadSelectedAssetCollection:self.selectedAssetCollection];
NSLog(@"didFinishPicking");
}
参考：
iOS14 适配 先行者
https://www.jianshu.com/p/a0b0303962bb
iOS14 隐私适配及部分解决方案
https://www.jianshu.com/p/1803bd950b90?devtype=android
