一、感言

新年伊始，万象更新，一转眼，就2019年了。

作为一个科班生，从事移动端开发好几年了，回顾曾经的摸爬滚打，兢兢业业，严格的来说，多少算是入行了。

过去成绩如何暂且不说，新的一年，我当加倍努力，凤凰涅槃，浴火重生。

 

二、介绍

在项目中，多媒体的使用非常常见，那么，询问设备的权限必不可少。

优点：这么做极大的增强了用户体验，友好地告知用户去开启权限。

例如：相机的使用权限、相册的使用权限、麦克风的使用权限等

 

三、代码

1、相机的使用权限 （导入 #import <AVFoundation/AVFoundation.h>）

if (![UIImagePickerController isSourceTypeAvailable:UIImagePickerControllerSourceTypeCamera]){     [self showAlertMessage:@"该设备不支持相机功能"];     return;}AVAuthorizationStatus authStatus = [AVCaptureDevice authorizationStatusForMediaType:AVMediaTypeVideo];if(authStatus == AVAuthorizationStatusRestricted || authStatus == AVAuthorizationStatusDenied){     [self showAlertMessage:@"应用相机权限受限,请在设置中启用"];     return; }UIImagePickerController *picker = [[UIImagePickerController alloc] init];picker.sourceType = UIImagePickerControllerSourceTypeCamera;picker.delegate = self;[self presentViewController:picker animated:YES completion:nil];

2、相册的使用权限（导入  #import<Photos/PHPhotoLibrary.h>）

if (![UIImagePickerController isSourceTypeAvailable:UIImagePickerControllerSourceTypePhotoLibrary]) {     [self showAlertMessage:@"该设备不支持相册功能~"];     return;}PHAuthorizationStatus status = [PHPhotoLibrary authorizationStatus];if (status == PHAuthorizationStatusRestricted || status == PHAuthorizationStatusDenied){    [self showAlertMessage:@"应用相册权限受限,请在设置中启用"];    return;}    UIImagePickerController *picker = [[UIImagePickerController alloc] init];picker.sourceType = UIImagePickerControllerSourceTypePhotoLibrary;picker.delegate = self;[self presentViewController:picker animated:YES completion:nil];

3、麦克风的使用权限（导入 #import <AVFoundation/AVFoundation.h>）

AVAuthorizationStatus audioAuthStatus = [AVCaptureDevice authorizationStatusForMediaType:AVMediaTypeAudio];    if (audioAuthStatus == AVAuthorizationStatusNotDetermined) {  //未询问用户是否授权    //第一次询问用户是否进行授权，只会调用一次    [AVCaptureDevice requestAccessForMediaType:AVMediaTypeAudio completionHandler:^(BOOL granted) {       if (!granted) {          dispatch_async(dispatch_get_main_queue(), ^{ //手动禁止了授权             [self showAlertMessage:@"您已禁用了麦克风，请到设置中开启后重试~"];          });        }    }]; } else if (audioAuthStatus == AVAuthorizationStatusAuthorized) { //麦克风已开启     [[RecordUtility shareRecordUtility] startRecord]; //开始录音 } else{ //未授权     [self showAlertMessage:@"您未开启麦克风权限，请到设置中开启后重试~"]; }

 注意：跳转到设置中开启权限（CCBlcokAlertView是继承自UIAlertView的alertView，自己自定义一下吧，简单）

-(void)showAlertMessage:(NSString *)message{    CCBlockAlertView *alertView = [[CCBlockAlertView alloc] initWithTitle:@"提示" message:message delegate:nil cancelButtonTitle:nil otherButtonTitles:@"确定", nil];    alertView.delegate = alertView;    alertView.blockAlertViewDidDismissWithButtonIndex = ^(CCBlockAlertView *blockAlertView, int buttonIndex) {        if (buttonIndex == 1) { // 点击了去设置,跳转设置            NSURL *url = [NSURL URLWithString:UIApplicationOpenSettingsURLString];            if ([[UIApplication sharedApplication] canOpenURL:url]) {                [[UIApplication sharedApplication] openURL:url];            }        }    };    [alertView show];}