1 iOS 11 默认拥有读取相册的权限(写过测试代码,已验证),为了做兼容,以前的相册权限自然还要写。
2 NSPhotoLibraryAddUsageDescription和NSPhotoLibraryUsageDescription
如果在iOS11下,写入 一张图片时,在崩溃里有时让你在Info.plist加NSPhotoLibraryUsageDescription,有时加NSPhotoLibraryAddUsageDescription。我们作何选择,建议使用NSPhotoLibraryUsageDescription,读写都有了。
3 获取权限时,下面这种方式不准: PHAuthorizationStatus status = [PHPhotoLibrary authorizationStatus]。 这行代码在iOS11实在是不准,有时一直返回PHAuthorizationStatusNotDetermined,怀疑是没有明显的声明读取权限,所以有问题。
4 iOS 11 下,如何检测权限呢? 使用以下代码
[PHPhotoLibrary requestAuthorization:^(PHAuthorizationStatus status) { dispatch_async(dispatch_get_main_queue(), ^{ //注意回到主线程,做UI的操作 }); }];
5 同时注意到 PHOTOS_CLASS_AVAILABLE_IOS_TVOS(8_0, 10_0) @interface PHPhotoLibrary ,iOS11后,苹果应该弃用了PHPhotoLibrary,具体使用哪个替换,暂时还没有找到
6 枚举值解释
typedef NS_ENUM(NSInteger, PHAuthorizationStatus) { PHAuthorizationStatusNotDetermined = 0, // User has not yet made a choice with regards to this application //用户还没用做出选择 PHAuthorizationStatusRestricted, // This application is not authorized to access photo data. // The user cannot change this application’s status, possibly due to active restrictions // such as parental controls being in place.
//没有权限使用相册,用户也不能改变权限,可能权限受家长控制的 PHAuthorizationStatusDenied, // User has explicitly denied this application access to photos data.
//用户禁止使用相册 PHAuthorizationStatusAuthorized // User has authorized this application to access photos data. //用户允许使用相册 } PHOTOS_AVAILABLE_IOS_TVOS(8_0, 10_0);
7 保存图片的类已经封装好,点击githup地址下载
8 提示用户跳转到设置页面
[[UIApplication sharedApplication] openURL:[NSURL URLWithString:UIApplicationOpenSettingsURLString]];
不要再使用
[[UIApplication sharedApplication] openURL:[NSURL URLWithString:@"prefs:root=Photos"]];
如果出现 prefs:root,苹果会拒绝
9 使用方法
- 把 HHSaveImage.h 和 HHSaveImage.m拖入你的工程
- 引入头文件,然后一行代码 [HHSaveImage saveImage:image SaveImageCompletionBlock:^(BOOL isSuccess, NSError *error) { if (isSuccess) { NSLog(@"成功"); }else{ NSLog(@"失败"); } }];