借助 iOS 8 中的新功能，如果您在应用程序中使用相机，它会请求访问相机的权限，然后当您尝试重新拍摄照片时，它会请求访问照片库的权限。下次启动应用程序时，我希望检查相机和照片库是否具有访问权限。
对于相机，我检查它
if ([AVCaptureDevice authorizationStatusForMediaType:AVMediaTypeVideo] == AVAuthorizationStatusDenied)
{
// do something
}
我正在为照片库寻找类似的东西。
我知道这已经得到解答，但只是为了扩展@Tim 答案，这里是您需要的代码（iOS 8 及更高版本）：
PHAuthorizationStatus status = [PHPhotoLibrary authorizationStatus];
if (status == PHAuthorizationStatusAuthorized) {
// Access has been granted.
}
else if (status == PHAuthorizationStatusDenied) {
// Access has been denied.
}
else if (status == PHAuthorizationStatusNotDetermined) {
// Access has not been determined.
[PHPhotoLibrary requestAuthorization:^(PHAuthorizationStatus status) {
if (status == PHAuthorizationStatusAuthorized) {
// Access has been granted.
}
else {
// Access has been denied.
}
}];
}
else if (status == PHAuthorizationStatusRestricted) {
// Restricted access - normally won't happen.
}
不要忘记#import <Photos/Photos.h>
如果您使用的是 Swift 3.0 或更高版本，则可以使用以下代码：
// Get the current authorization state.
let status = PHPhotoLibrary.authorizationStatus()
if (status == PHAuthorizationStatus.authorized) {
// Access has been granted.
}
else if (status == PHAuthorizationStatus.denied) {
// Access has been denied.
}
else if (status == PHAuthorizationStatus.notDetermined) {
// Access has not been determined.
PHPhotoLibrary.requestAuthorization({ (newStatus) in
if (newStatus == PHAuthorizationStatus.authorized) {
}
else {
}
})
}
else if (status == PHAuthorizationStatus.restricted) {
// Restricted access - normally won't happen.
}
不要忘记import Photos
检查+[PHPhotoLibrary authorizationStatus]- 如果未设置，它将返回PHAuthorizationStatusNotDetermined. （然后，您可以使用+requestAuthorization:同一类请求访问权限。）
和形式一样，Swift 2.X版本：
func checkPhotoLibraryPermission() {
let status = PHPhotoLibrary.authorizationStatus()
switch status {
case .Authorized:
//handle authorized status
case .Denied, .Restricted :
//handle denied status
case .NotDetermined:
// ask for permissions
PHPhotoLibrary.requestAuthorization() { (status) -> Void in
switch status {
case .Authorized:
// as above
case .Denied, .Restricted:
// as above
case .NotDetermined:
// won't happen but still
}
}
}
}
和斯威夫特 3 / 斯威夫特 4：
import Photos
func checkPhotoLibraryPermission() {
let status = PHPhotoLibrary.authorizationStatus()
switch status {
case .authorized:
//handle authorized status
case .denied, .restricted :
//handle denied status
case .notDetermined:
// ask for permissions
PHPhotoLibrary.requestAuthorization { status in
switch status {
case .authorized:
// as above
case .denied, .restricted:
// as above
case .notDetermined:
// won't happen but still
}
}
}
}
这是 iOS 8+ 的完整指南（没有 ALAssetLibrary）：
首先，我们必须提供使用说明，因为现在PHPhotoLibrary需要它。
为此，我们必须打开文件info.plist，找到密钥Privacy - Photo Library Usage Description并为其提供值。如果密钥不存在，则只需创建它。
这是一个图像示例：
还要确保文件中的键值Bundle name不为空info.plist。
现在当我们有描述时，我们通常可以通过调用requestAuthorization方法请求授权：
[PHPhotoLibrary requestAuthorization:^(PHAuthorizationStatus status) {
switch (status) {
case PHAuthorizationStatusAuthorized:
NSLog(@"PHAuthorizationStatusAuthorized");
break;
case PHAuthorizationStatusDenied:
NSLog(@"PHAuthorizationStatusDenied");
break;
case PHAuthorizationStatusNotDetermined:
NSLog(@"PHAuthorizationStatusNotDetermined");
break;
case PHAuthorizationStatusRestricted:
NSLog(@"PHAuthorizationStatusRestricted");
break;
}
}];
注意 1： requestAuthorization实际上并不是每次通话都显示警报。它每隔一段时间显示一次，保存用户的答案并每次返回，而不是再次显示警报。但由于这不是我们需要的，这里有一个有用的代码，每次我们需要权限时总是显示警报（重定向到设置）：
- (void)requestAuthorizationWithRedirectionToSettings {
dispatch_async(dispatch_get_main_queue(), ^{
PHAuthorizationStatus status = [PHPhotoLibrary authorizationStatus];
if (status == PHAuthorizationStatusAuthorized)
{
//We have permission. Do whatever is needed
}
else
{
//No permission. Trying to normally request it
[PHPhotoLibrary requestAuthorization:^(PHAuthorizationStatus status) {
if (status != PHAuthorizationStatusAuthorized)
{
//User don't give us permission. Showing alert with redirection to settings
//Getting description string from info.plist file
NSString *accessDescription = [[NSBundle mainBundle] objectForInfoDictionaryKey:@"NSPhotoLibraryUsageDescription"];
UIAlertController * alertController = [UIAlertController alertControllerWithTitle:accessDescription message:@"To give permissions tap on 'Change Settings' button" preferredStyle:UIAlertControllerStyleAlert];
UIAlertAction *cancelAction = [UIAlertAction actionWithTitle:@"Cancel" style:UIAlertActionStyleCancel handler:nil];
[alertController addAction:cancelAction];
UIAlertAction *settingsAction = [UIAlertAction actionWithTitle:@"Change Settings" style:UIAlertActionStyleDefault handler:^(UIAlertAction * _Nonnull action) {
[[UIApplication sharedApplication] openURL:[NSURL URLWithString:UIApplicationOpenSettingsURLString]];
}];
[alertController addAction:settingsAction];
[[UIApplication sharedApplication].keyWindow.rootViewController presentViewController:alertController animated:YES completion:nil];
}
}];
}
});
}
常见问题1：部分用户抱怨info.plist在对文件进行上述更改后，应用程序没有显示警报。
解决方案：为了测试尝试Bundle Identifier从项目文件更改为其他文件，清理并重建应用程序。如果它开始工作，那么一切都很好，将其重命名。
常见问题 2：当应用程序在按照文档中承诺的方式运行时，当应用程序获得照片权限时，没有更新获取结果（并且使用来自这些获取请求的图像的视图仍然相应地为空），存在一些特定情况。
实际上，当我们使用这样的错误代码时会发生这种情况：
- (void)viewDidLoad {
if ([PHPhotoLibrary authorizationStatus] != PHAuthorizationStatusAuthorized)
{
//Reloading some view which needs photos
[self reloadCollectionView];
// ...
} else {
[PHPhotoLibrary requestAuthorization:^(PHAuthorizationStatus status) {
if (status == PHAuthorizationStatusAuthorized)
[self reloadCollectionView];
// ...
}];
}
// ...
}
在这种情况下，如果用户拒绝授予权限viewDidLoad然后跳转到设置，允许并跳转回应用程序，则不会刷新视图，因为[self reloadCollectionView]未发送获取请求。
解决方案：我们只需要[self reloadCollectionView]在需要授权之前调用并执行其他获取请求，如下所示：
- (void)viewDidLoad {
//Reloading some view which needs photos
[self reloadCollectionView];
if ([PHPhotoLibrary authorizationStatus] != PHAuthorizationStatusAuthorized)
{
// ...
}
我是这样做的：
- (void)requestPermissions:(GalleryPermissions)block
{
PHAuthorizationStatus status = [PHPhotoLibrary authorizationStatus];
switch (status)
{
case PHAuthorizationStatusAuthorized:
block(YES);
break;
case PHAuthorizationStatusNotDetermined:
{
[PHPhotoLibrary requestAuthorization:^(PHAuthorizationStatus authorizationStatus)
{
if (authorizationStatus == PHAuthorizationStatusAuthorized)
{
block(YES);
}
else
{
block(NO);
}
}];
break;
}
default:
block(NO);
break;
}
}
我根据成功或失败发送我需要做的事情。
iOS 14及更高版本 Apple 添加了一项新功能，该功能将限制对照片库的访问。根据您的要求（例如创建自定义照片库），您必须检查用户是否仅授予有限访问权限并希望授予完全访问权限。
为了向后兼容，即使您获得有限访问权限，不带参数的旧版本也会返回 .authorized 。
斯威夫特 5：
switch PHPhotoLibrary.authorizationStatus(for: .readWrite) {
case .notDetermined:
// ask for access
case .restricted, .denied:
// sorry
case .authorized:
// we have full access
// new option:
case .limited:
// we only got access to some photos of library
}
有一个代码可以再次调用受限访问屏幕。如果用户仅授予 .limited 访问权限，并且您希望用户再次选择图像。
PHPhotoLibrary.shared().presentLimitedLibraryPicker(from: presentVCObj)
每次重新启动应用程序时，iOS 都会显示警报以通知用户访问受限。如果您想停止该警报
，请在Info.plist 中PHPhotoLibraryPreventAutomaticLimitedAccessAlert添加到 YES
更新：SWIFT 3 IOS10
注意：在 AppDelegate.swift 中导入 Photos 如下
// AppDelegate.swift
导入 UIKit
导入照片
...
func applicationDidBecomeActive(_ application: UIApplication) {
// Restart any tasks that were paused (or not yet started) while the application was inactive. If the application was previously in the background, optionally refresh the user interface.
photoLibraryAvailabilityCheck()
}
//MARK:- PHOTO LIBRARY ACCESS CHECK
func photoLibraryAvailabilityCheck()
{
if PHPhotoLibrary.authorizationStatus() == PHAuthorizationStatus.authorized
{
}
else
{
PHPhotoLibrary.requestAuthorization(requestAuthorizationHandler)
}
}
func requestAuthorizationHandler(status: PHAuthorizationStatus)
{
if PHPhotoLibrary.authorizationStatus() == PHAuthorizationStatus.authorized
{
}
else
{
alertToEncouragePhotoLibraryAccessWhenApplicationStarts()
}
}
//MARK:- CAMERA & GALLERY NOT ALLOWING ACCESS - ALERT
func alertToEncourageCameraAccessWhenApplicationStarts()
{
//Camera not available - Alert
let internetUnavailableAlertController = UIAlertController (title: "Camera Unavailable", message: "Please check to see if it is disconnected or in use by another application", preferredStyle: .alert)
let settingsAction = UIAlertAction(title: "Settings", style: .destructive) { (_) -> Void in
let settingsUrl = NSURL(string:UIApplicationOpenSettingsURLString)
if let url = settingsUrl {
DispatchQueue.main.async {
UIApplication.shared.open(url as URL, options: [:], completionHandler: nil) //(url as URL)
}
}
}
let cancelAction = UIAlertAction(title: "Okay", style: .default, handler: nil)
internetUnavailableAlertController .addAction(settingsAction)
internetUnavailableAlertController .addAction(cancelAction)
self.window?.rootViewController!.present(internetUnavailableAlertController , animated: true, completion: nil)
}
func alertToEncouragePhotoLibraryAccessWhenApplicationStarts()
{
//Photo Library not available - Alert
let cameraUnavailableAlertController = UIAlertController (title: "Photo Library Unavailable", message: "Please check to see if device settings doesn't allow photo library access", preferredStyle: .alert)
let settingsAction = UIAlertAction(title: "Settings", style: .destructive) { (_) -> Void in
let settingsUrl = NSURL(string:UIApplicationOpenSettingsURLString)
if let url = settingsUrl {
UIApplication.shared.open(url as URL, options: [:], completionHandler: nil)
}
}
let cancelAction = UIAlertAction(title: "Okay", style: .default, handler: nil)
cameraUnavailableAlertController .addAction(settingsAction)
cameraUnavailableAlertController .addAction(cancelAction)
self.window?.rootViewController!.present(cameraUnavailableAlertController , animated: true, completion: nil)
}
从阿尔文乔治更新的答案
使用 ALAssetsLibrary 应该可以：
ALAuthorizationStatus status = [ALAssetsLibrary authorizationStatus];
switch (status) {
case ALAuthorizationStatusNotDetermined: {
// not determined
break;
}
case ALAuthorizationStatusRestricted: {
// restricted
break;
}
case ALAuthorizationStatusDenied: {
// denied
break;
}
case ALAuthorizationStatusAuthorized: {
// authorized
break;
}
default: {
break;
}
}
I have a simple solution on swift 2.0
//
// AppDelegate.swift
// HoneyBadger
//
// Created by fingent on 14/08/15.
// Copyright (c) 2015 fingent. All rights reserved.
//
import UIKit
import Photos
@UIApplicationMain
class AppDelegate: UIResponder, UIApplicationDelegate {
var window: UIWindow?
func application(application: UIApplication, didFinishLaunchingWithOptions launchOptions: [NSObject: AnyObject]?) -> Bool {
self.window?.makeKeyAndVisible()
self.window = UIWindow(frame: UIScreen.mainScreen().bounds)
let storyboard = UIStoryboard(name: "Main", bundle: nil)
let initialViewController = storyboard.instantiateViewControllerWithIdentifier("LoginPageID")
self.window?.rootViewController = initialViewController
self.window?.makeKeyAndVisible()
return true
}
func applicationDidEnterBackground(application: UIApplication) {
print("Application On background", terminator: "")
}
func applicationDidBecomeActive(application: UIApplication) {
cameraAllowsAccessToApplicationCheck()
photoLibraryAvailabilityCheck()
}
//MARK:- CAMERA ACCESS CHECK
func cameraAllowsAccessToApplicationCheck()
{
let authorizationStatus = AVCaptureDevice.authorizationStatusForMediaType(AVMediaTypeVideo)
switch authorizationStatus {
case .NotDetermined:
// permission dialog not yet presented, request authorization
AVCaptureDevice.requestAccessForMediaType(AVMediaTypeVideo,
completionHandler: { (granted:Bool) -> Void in
if granted {
print("access granted", terminator: "")
}
else {
print("access denied", terminator: "")
}
})
case .Authorized:
print("Access authorized", terminator: "")
case .Denied, .Restricted:
alertToEncourageCameraAccessWhenApplicationStarts()
default:
print("DO NOTHING", terminator: "")
}
}
//MARK:- PHOTO LIBRARY ACCESS CHECK
func photoLibraryAvailabilityCheck()
{
if PHPhotoLibrary.authorizationStatus() == PHAuthorizationStatus.Authorized
{
}
else
{
PHPhotoLibrary.requestAuthorization(requestAuthorizationHandler)
}
}
func requestAuthorizationHandler(status: PHAuthorizationStatus)
{
if PHPhotoLibrary.authorizationStatus() == PHAuthorizationStatus.Authorized
{
}
else
{
alertToEncouragePhotoLibraryAccessWhenApplicationStarts()
}
}
//MARK:- CAMERA & GALLERY NOT ALLOWING ACCESS - ALERT
func alertToEncourageCameraAccessWhenApplicationStarts()
{
//Camera not available - Alert
let internetUnavailableAlertController = UIAlertController (title: "Camera Unavailable", message: "Please check to see if it is disconnected or in use by another application", preferredStyle: .Alert)
let settingsAction = UIAlertAction(title: "Settings", style: .Destructive) { (_) -> Void in
let settingsUrl = NSURL(string:UIApplicationOpenSettingsURLString)
if let url = settingsUrl {
dispatch_async(dispatch_get_main_queue()) {
UIApplication.sharedApplication().openURL(url)
}
}
}
let cancelAction = UIAlertAction(title: "Okay", style: .Default, handler: nil)
internetUnavailableAlertController .addAction(settingsAction)
internetUnavailableAlertController .addAction(cancelAction)
self.window?.rootViewController!.presentViewController(internetUnavailableAlertController , animated: true, completion: nil)
}
func alertToEncouragePhotoLibraryAccessWhenApplicationStarts()
{
//Photo Library not available - Alert
let cameraUnavailableAlertController = UIAlertController (title: "Photo Library Unavailable", message: "Please check to see if device settings doesn't allow photo library access", preferredStyle: .Alert)
let settingsAction = UIAlertAction(title: "Settings", style: .Destructive) { (_) -> Void in
let settingsUrl = NSURL(string:UIApplicationOpenSettingsURLString)
if let url = settingsUrl {
UIApplication.sharedApplication().openURL(url)
}
}
let cancelAction = UIAlertAction(title: "Okay", style: .Default, handler: nil)
cameraUnavailableAlertController .addAction(settingsAction)
cameraUnavailableAlertController .addAction(cancelAction)
self.window?.rootViewController!.presentViewController(cameraUnavailableAlertController , animated: true, completion: nil)
}
}
斯威夫特 2.0+
基于此处的答案组合，我为自己创建了一个解决方案。此方法仅检查是否没有权限。
我们得到了一种pickVideo()需要访问照片的方法。如果不是.Authorized请求许可。
如果未给予许可，pickVideo()将不会被调用，并且用户无法选择视频。
只要用户没有完全访问照片，您就可以避免让他们选择“或崩溃”您的应用程序。
// Method that requires access to photos
func pickVideo(){
// Check for permission
if PHPhotoLibrary.authorizationStatus() != .Authorized{
// If there is no permission for photos, ask for it
PHPhotoLibrary.requestAuthorization(requestAuthorizationHandler)
return
}
//... pick video code here...
}
func requestAuthorizationHandler(status: PHAuthorizationStatus){
if PHPhotoLibrary.authorizationStatus() == .Authorized{
// The user did authorize, so, pickVideo may be opened
// Ensure pickVideo is called from the main thread to avoid GUI problems
dispatch_async(dispatch_get_main_queue()) {
pickVideo()
}
} else {
// Show Message to give permission in Settings
let alertController = UIAlertController(title: "Error", message: "Enable photo permissions in settings", preferredStyle: .Alert)
let settingsAction = UIAlertAction(title: "Settings", style: .Default) { (alertAction) in
if let appSettings = NSURL(string: UIApplicationOpenSettingsURLString) {
UIApplication.sharedApplication().openURL(appSettings)
}
}
alertController.addAction(settingsAction)
// If user cancels, do nothing, next time Pick Video is called, they will be asked again to give permission
let cancelAction = UIAlertAction(title: "Cancel", style: .Cancel, handler: nil)
alertController.addAction(cancelAction)
// Run GUI stuff on main thread
dispatch_async(dispatch_get_main_queue()) {
self.presentViewController(alertController, animated: true, completion: nil)
}
}
}
这是我通常使用的一个小而简单的片段。
- (void)requestPhotoAuthorization:(void (^)(BOOL granted))granted
{
void (^handler)(PHAuthorizationStatus) = ^(PHAuthorizationStatus status)
{
if (status == PHAuthorizationStatusAuthorized) granted(YES);
else if (status == PHAuthorizationStatusNotDetermined) [PHPhotoLibrary requestAuthorization:handler];
else granted(NO);
};
handler([PHPhotoLibrary authorizationStatus]);
}