一、iOS应用权限检测
在涉及到这个问题的时候，首先为了适配iOS10系统，我们必须首先在info.plist文件中声明将要用到的权限，否则将会引起崩溃如下：
“This app has crashed because it attempted to access privacy-sensitive data without a usage description. The app's Info.plist must contain an NSMicrophoneUsageDescription key with a string value explaining to the user how the app uses this data.”
那么设置权限声明的的方式如下：
屏幕快照 2017-01-09 下午7.52.07.png
我们需要点击Info.plist中加号，增加需要授权key值并填写相应的权限使用声明。
1.相机与麦克风
检测相机与麦克风权限需要导入AVFoundataion框架
#import <AVFoundation/AVFoundation.h>
/**
//相机、麦克风的授权状态
typedef NS_ENUM(NSInteger, AVAuthorizationStatus) {
AVAuthorizationStatusNotDetermined = 0,//未询问过用户是否授权
AVAuthorizationStatusRestricted, //未授权，例如家长控制
AVAuthorizationStatusDenied, //未授权，用户曾选择过拒绝授权
AVAuthorizationStatusAuthorized //已经授权
} NS_AVAILABLE_IOS(7_0) __TVOS_PROHIBITED;
*/
//AVMediaTypeVideo:相机权限
//AVMediaTypeAudio：麦克风权限
/**
检测相机的方法
@param permissionGranted 相机授权成功执行的方法
@param noPermission 相机授权失败或者未授权执行的方法
*/
+ (void)checkCameraAuthorizationGrand:(void (^)())permissionGranted withNoPermission:(void (^)())noPermission{
AVAuthorizationStatus videoAuthStatus = [AVCaptureDevice authorizationStatusForMediaType:AVMediaTypeVideo];
switch (videoAuthStatus) {
case AVAuthorizationStatusNotDetermined:
{
//第一次提示用户授权
[AVCaptureDevice requestAccessForMediaType:AVMediaTypeVideo completionHandler:^(BOOL granted) {
granted ? permissionGranted() : noPermission();
}];
break;
}
case AVAuthorizationStatusAuthorized:
{
//通过授权
permissionGranted();
break;
}
case AVAuthorizationStatusRestricted:
//不能授权
NSLog(@"不能完成授权，可能开启了访问限制");
case AVAuthorizationStatusDenied:{
//提示跳转到相机设置(这里使用了blockits的弹窗方法）
UIAlertView *alert = [UIAlertView bk_showAlertViewWithTitle:@"相机授权" message:@"跳转相机授权设置" cancelButtonTitle:@"取消" otherButtonTitles:@[@"设置"] handler:^(UIAlertView *alertView, NSInteger buttonIndex) {
if (buttonIndex == 1) {
//请求授权
[self requetSettingForVideo];
}
}];
[alert show];
}
break;
default:
break;
}
}
2.相册
这里针对于iOS8及其以后的系统相册检测方法，使用到的PHPhotoLibrary需要导入Photos框架。
#import <Photos/Photos.h>
//相册的授权状态
typedef NS_ENUM(NSInteger, PHAuthorizationStatus) {
PHAuthorizationStatusNotDetermined = 0, // User has not yet made a choice with regards to this application
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.
PHAuthorizationStatusDenied, // User has explicitly denied this application access to photos data.
PHAuthorizationStatusAuthorized // User has authorized this application to access photos data.
} PHOTOS_AVAILABLE_IOS_TVOS(8_0, 10_0);
/**
检测访问相册的权限
这里的方法适用于iOS8及其以后版本
@param permissionGranted 相册授权成功执行的方法
@param noPermission 相册授权失败或者未授权执行的方法
*/
+ (void)checkPhotoAlbumAuthorizationGrand:(void (^)())permissionGranted withNoPermission:(void (^)())noPermission{
PHAuthorizationStatus photoAuthStatus = [PHPhotoLibrary authorizationStatus];
switch (photoAuthStatus) {
case PHAuthorizationStatusNotDetermined:
{
//第一次提示用户授权
[PHPhotoLibrary requestAuthorization:^(PHAuthorizationStatus status) {
status == PHAuthorizationStatusAuthorized ? permissionGranted() : noPermission();
}];
break;
}
case PHAuthorizationStatusAuthorized:
{
//已经通过授权
permissionGranted();
break;
}
case PHAuthorizationStatusRestricted:
//不能授权
NSLog(@"不能完成授权，可能开启了访问限制");
case PHAuthorizationStatusDenied:{
//提示跳转相册授权设置
UIAlertView *alert = [UIAlertView bk_showAlertViewWithTitle:@"相册授权" message:@"跳转相册授权设置" cancelButtonTitle:@"取消" otherButtonTitles:@[@"设置"] handler:^(UIAlertView *alertView, NSInteger buttonIndex) {
if (buttonIndex == 1) {
[self requetSettingForPhotoAlbum];
}
}];
[alert show];
break;
}
default:
break;
}
}
二、iOS应用跳转权限设置
在iOS8以后的系统中，跳转设置使用如下方法：
+ (void)requetSettingForAuth{
NSURL *url = [NSURL URLWithString:UIApplicationOpenSettingsURLString];
if ([ [UIApplication sharedApplication] canOpenURL:url])
{
[[UIApplication sharedApplication] openURL:url];
}
}
三、使用注意
我们在检测授权的时候弹窗会有授权和不授权的回调，有时候我们会在这里处理一些自定义UI问题，这里一定要在主线程中进行，否则会出现崩溃等问题，回到主线程中的操作如下：
dispatch_async(dispatch_get_main_queue(), ^{
//处理UI问题
});
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