友好访问权限篇：访问语音、相册、通讯录----iOS

我们经常使用到iOS访问相册、语音等一些权限，当用户使用到此功能时就给出弹出框，iOS默认第一次访问时会自动去请求系统权限。如果没有其他交互貌似可以符合我们的要求。但当我们有交互，比如点击录音我们自己有界面交互。

所以我们需要在点击时获取用户权限状态，然后再根据状态值去判断我们相应操作。是需要弹出用户允许权限，还是需要通知到设置中开启权限，还是已经允许直接给出我们代码交互逻辑。

1，在plist文件设置权限

	Privacy - Microphone Usage Description：设置麦克风权限
	Privacy - Photo Library Additions Usage Description：设置保存图片到相册权限
	Privacy - Photo Library Usage Description：设置访问相册权限
	Privacy - Camera Usage Description：打开相机权限
	Privacy - Contacts Usage Description：设置通讯录权限
	或者设置打开plist——> Source Code添加
	`需要拍照上传图片信息，是否允许打开相机？
NSFaceIDUsageDescription
需要您的同意才能访问Face ID
NSLocationAlwaysUsageDescription
拍照会获取您的地理位置按地理信息分类照片
NSMicrophoneUsageDescription
请求访问麦克风
NSPhotoLibraryAddUsageDescription
保存图片
NSPhotoLibraryUsageDescription
需要添加图片，是否允许打开相册
NSContactsUsageDescription
访问通讯录`

2，代码逻辑编写。

	获取访问相册权限导入#import 

// 询问 相册权限
- (void)getPhotoLibrary:(void(^)(BOOL))result {
    /// 获取当前的状态
    PHAuthorizationStatus status = [PHPhotoLibrary authorizationStatus];
    if (status == PHAuthorizationStatusAuthorized) {
        result(YES);
        return;
    }
    if (status == PHAuthorizationStatusRestricted || status == PHAuthorizationStatusDenied) {
        result(NO); //无权限
        return ;
    }
    if (status == PHAuthorizationStatusNotDetermined) {
        [self getPhotoLibrary];
        ;
    }
    
}
- (void)getPhotoLibrary{
    [PHPhotoLibrary requestAuthorization:^(PHAuthorizationStatus status) {
        NSLog(@"%@",[NSThread currentThread]);
        dispatch_async(dispatch_get_main_queue(), ^{
            
            
        });
    }];
}
- (void)goset{
    NSString *message = @"无法访问相册，请在设置中打开访问相册权限";
    UIAlertView *alert = [[UIAlertView alloc] initWithTitle:@"提示" message:message delegate:self cancelButtonTitle:@"取消" otherButtonTitles:@"去设置", nil];
    [alert show];
}

- (void)alertView:(UIAlertView *)alertView clickedButtonAtIndex:(NSInteger)buttonIndex {
    
    if (buttonIndex == 1) { // 去设置界面，开启相机访问权限
        [[UIApplication sharedApplication] openURL:[NSURL URLWithString:UIApplicationOpenSettingsURLString]];
    }
    
}

访问麦克风权限，导入#import

- (void) checkAudioStatus{
    AVAuthorizationStatus authStatus = [AVCaptureDevice authorizationStatusForMediaType:AVMediaTypeAudio];
    switch (authStatus) {
        case AVAuthorizationStatusNotDetermined:
            [self getAVMediaTypeAudio];
            break;
        case AVAuthorizationStatusRestricted:
            [self goset];
            
            
            break;
        case AVAuthorizationStatusDenied:
            [self goset];
            
            break;
        case AVAuthorizationStatusAuthorized:
            //          已授权做自己的事;
            break;
        default:
            break;
    }
}

- (void)getAVMediaTypeAudio{
    [AVCaptureDevice requestAccessForMediaType:AVMediaTypeAudio completionHandler:^(BOOL granted) {
        dispatch_async(dispatch_get_main_queue(), ^{
            
        });
    }];
}





- (void)goset{
    NSString *message = @"无法录音，请在设置中打开麦克风访问权限";
    UIAlertView *alert = [[UIAlertView alloc] initWithTitle:@"提示" message:message delegate:self cancelButtonTitle:@"取消" otherButtonTitles:@"去设置", nil];
    [alert show];
}

- (void)alertView:(UIAlertView *)alertView clickedButtonAtIndex:(NSInteger)buttonIndex {
    
    if (buttonIndex == 1) { // 去设置界面，开启麦克风访问权限
        [[UIApplication sharedApplication] openURL:[NSURL URLWithString:UIApplicationOpenSettingsURLString]];
    }
    
}

获取通讯录权限：iOS9之后ContactsUI代替了AddressBookUI，Contacts代替了AddressBook。导入#import 

#pragma mark 请求通讯录权限
- (void)requestAuthorizationForAddressBook{
    
    CNAuthorizationStatus status = [CNContactStore authorizationStatusForEntityType:CNEntityTypeContacts];
    if (status == CNAuthorizationStatusNotDetermined) { //用户没有设置
        //       获取权限
            [self getAddressBook];
    }
    else if(status == CNAuthorizationStatusRestricted ||status == CNAuthorizationStatusDenied){//弹出提示
        [self goset];
    }
    else if (status == CNAuthorizationStatusAuthorized){//已经授权
        //做自己的事情
    }
    
}

- (void)getAddressBook{
    //请求通讯录权限
    CNContactStore *store = [[CNContactStore alloc] init];
    [store requestAccessForEntityType:CNEntityTypeContacts completionHandler:^(BOOL granted, NSError*  _Nullable error) {
        if (error) {
            NSLog(@"授权失败");
        }else {
            NSLog(@"成功授权");
        }
    }];
}

- (void)goset{
    NSString *message = @"无法访问通讯录，请在设置中打开通讯录访问权限";
    UIAlertView *alert = [[UIAlertView alloc] initWithTitle:@"提示" message:message delegate:self cancelButtonTitle:@"取消" otherButtonTitles:@"去设置", nil];
    [alert show];
}

- (void)alertView:(UIAlertView *)alertView clickedButtonAtIndex:(NSInteger)buttonIndex {
    
    if (buttonIndex == 1) { // 去设置界面，开启通讯录访问权限
        [[UIApplication sharedApplication] openURL:[NSURL URLWithString:UIApplicationOpenSettingsURLString]];
    }
    
}

其他权限类似，就不一一写出来了。如果大家有什么更好的方式，欢迎留言，谢谢。