1.引入头文件:

#import<AVFoundation/AVFoundation.h>

#import<AssetsLibrary/AssetsLibrary.h>

2.查看是否有权限

查看相册权限

ALAuthorizationStatus author = [ALAssetsLibrary authorizationStatus]; author有四种状态;

查看麦克风,摄像头权限

AVAuthorizationStatus authStatus = [AVCaptureDevice authorizationStatusForMediaType:AVMediaTypeVideo];

3.跳转到设置页面设置权限

[[UIApplication sharedApplication] openURL:[NSURL URLWithString:@"APP-Prefs:root=Privacy"]];

需要在url scheme中设置prefs