优化相机调用前的权限检查，防止第一次请求权限用户拒绝时的相机黑屏

TZImagePickerController/TZImagePickerController/TZImageManager.h

@@ -40,6 +40,7 @@
 /// Return YES if Authorized 返回YES如果得到了授权
 - (BOOL)authorizationStatusAuthorized;
 + (NSInteger)authorizationStatus;
+- (void)requestAuthorizationWithCompletion:(void (^)())completion;
 
 /// Get Album 获得相册/相册数组
 - (void)getCameraRollAlbum:(BOOL)allowPickingVideo allowPickingImage:(BOOL)allowPickingImage completion:(void (^)(TZAlbumModel *model))completion;

TZImagePickerController/TZImagePickerController/TZImageManager.m

@@ -62,7 +62,7 @@ static CGFloat TZScreenScale;
         /**
          * 当某些情况下AuthorizationStatus == AuthorizationStatusNotDetermined时，无法弹出系统首次使用的授权alertView，系统应用设置里亦没有相册的设置，此时将无法使用，故作以下操作，弹出系统首次使用的授权alertView
          */
-        [self requestAuthorizationWhenNotDetermined];
+        [self requestAuthorizationWithCompletion:nil];
     }
     
     return status == 3;
@@ -77,18 +77,27 @@ static CGFloat TZScreenScale;
     return NO;
 }
 
-//AuthorizationStatus == AuthorizationStatusNotDetermined 时询问授权弹出系统授权alertView
-- (void)requestAuthorizationWhenNotDetermined {
+- (void)requestAuthorizationWithCompletion:(void (^)())completion {
+    void (^callCompletionBlock)() = ^(){
+        dispatch_async(dispatch_get_main_queue(), ^{
+            if (completion) {
+                completion();
+            }
+        });
+    };
+    
     if (iOS8Later) {
         dispatch_async(dispatch_get_global_queue(DISPATCH_QUEUE_PRIORITY_DEFAULT, 0), ^{
             [PHPhotoLibrary requestAuthorization:^(PHAuthorizationStatus status) {
-                dispatch_async(dispatch_get_main_queue(), ^{
-                });
+                callCompletionBlock();
             }];
         });
     } else {
         [self.assetLibrary enumerateGroupsWithTypes:ALAssetsGroupAll usingBlock:^(ALAssetsGroup *group, BOOL *stop) {
-        } failureBlock:nil];
+            callCompletionBlock();
+        } failureBlock:^(NSError *error) {
+            callCompletionBlock();
+        }];
     }
 }
 

TZImagePickerController/TZImagePickerController/TZPhotoPickerController.m

@@ -473,6 +473,7 @@ static CGSize AssetGridThumbnailSize;
 
 #pragma mark - Private Method
 
+/// 拍照按钮点击事件
 - (void)takePhoto {
     AVAuthorizationStatus authStatus = [AVCaptureDevice authorizationStatusForMediaType:AVMediaTypeVideo];
     if ((authStatus == AVAuthorizationStatusRestricted || authStatus ==AVAuthorizationStatusDenied) && iOS7Later) {
@@ -482,7 +483,26 @@ static CGSize AssetGridThumbnailSize;
         NSString *message = [NSString stringWithFormat:[NSBundle tz_localizedStringForKey:@"Please allow %@ to access your camera in \"Settings -> Privacy -> Camera\""],appName];
         UIAlertView * alert = [[UIAlertView alloc]initWithTitle:[NSBundle tz_localizedStringForKey:@"Can not use camera"] message:message delegate:self cancelButtonTitle:[NSBundle tz_localizedStringForKey:@"Cancel"] otherButtonTitles:[NSBundle tz_localizedStringForKey:@"Setting"], nil];
         [alert show];
-    } else { // 调用相机
+    } else if (authStatus == AVAuthorizationStatusNotDetermined) {
+        // fix issue 466, 防止用户首次拍照拒绝授权时相机页黑屏
+        if (iOS7Later) {
+            [AVCaptureDevice requestAccessForMediaType:AVMediaTypeVideo completionHandler:^(BOOL granted) {
+                if (granted) {
+                    dispatch_sync(dispatch_get_main_queue(), ^{
+                        [self pushImagePickerController];
+                    });
+                }
+            }];
+        } else {
+            [self pushImagePickerController];
+        }
+    } else {
+        [self pushImagePickerController];
+    }
+}
+
+// 调用相机
+- (void)pushImagePickerController {
     UIImagePickerControllerSourceType sourceType = UIImagePickerControllerSourceTypeCamera;
     if ([UIImagePickerController isSourceTypeAvailable: UIImagePickerControllerSourceTypeCamera]) {
         self.imagePickerVc.sourceType = sourceType;
@@ -493,7 +513,6 @@ static CGSize AssetGridThumbnailSize;
     } else {
         NSLog(@"模拟器中无法打开照相机,请在真机中使用");
     }
-    }
 }
 
 - (void)refreshBottomToolBarStatus {

TZImagePickerController/ViewController.m

@@ -132,7 +132,7 @@
             UIActionSheet *sheet = [[UIActionSheet alloc] initWithTitle:nil delegate:self cancelButtonTitle:@"取消" destructiveButtonTitle:nil otherButtonTitles:@"拍照",@"去相册选择", nil];
             [sheet showInView:self.view];
         } else {
-            [self pushImagePickerController];
+            [self pushTZImagePickerController];
         }
     } else { // preview photos or video / 预览照片或者视频
         id asset = _selectedAssets[indexPath.row];
@@ -196,7 +196,7 @@
 
 #pragma mark - TZImagePickerController
 
-- (void)pushImagePickerController {
+- (void)pushTZImagePickerController {
     if (self.maxCountTF.text.integerValue <= 0) {
         return;
     }
@@ -267,16 +267,35 @@
         // 无相机权限 做一个友好的提示
         UIAlertView * alert = [[UIAlertView alloc]initWithTitle:@"无法使用相机" message:@"请在iPhone的""设置-隐私-相机""中允许访问相机" delegate:self cancelButtonTitle:@"取消" otherButtonTitles:@"设置", nil];
         [alert show];
+    } else if (authStatus == AVAuthorizationStatusNotDetermined) {
+        // fix issue 466, 防止用户首次拍照拒绝授权时相机页黑屏
+        if (iOS7Later) {
+            [AVCaptureDevice requestAccessForMediaType:AVMediaTypeVideo completionHandler:^(BOOL granted) {
+                if (granted) {
+                    dispatch_sync(dispatch_get_main_queue(), ^{
+                        [self takePhoto];
+                    });
+                }
+            }];
+        } else {
+            [self takePhoto];
+        }
         // 拍照之前还需要检查相册权限
     } else if ([TZImageManager authorizationStatus] == 2) { // 已被拒绝，没有相册权限，将无法保存拍的照片
         UIAlertView * alert = [[UIAlertView alloc]initWithTitle:@"无法访问相册" message:@"请在iPhone的""设置-隐私-相册""中允许访问相册" delegate:self cancelButtonTitle:@"取消" otherButtonTitles:@"设置", nil];
         alert.tag = 1;
         [alert show];
-    } else if ([TZImageManager authorizationStatus] == 0) { // 正在弹框询问用户是否允许访问相册，监听权限状态
-        dispatch_after(dispatch_time(DISPATCH_TIME_NOW, (int64_t)(0.1 * NSEC_PER_SEC)), dispatch_get_main_queue(), ^{
-            return [self takePhoto];
-        });
-    } else { // 调用相机
+    } else if ([TZImageManager authorizationStatus] == 0) { // 未请求过相册权限
+        [[TZImageManager manager] requestAuthorizationWithCompletion:^{
+            [self takePhoto];
+        }];
+    } else {
+        [self pushImagePickerController];
+    }
+}
+
+// 调用相机
+- (void)pushImagePickerController {
     UIImagePickerControllerSourceType sourceType = UIImagePickerControllerSourceTypeCamera;
     if ([UIImagePickerController isSourceTypeAvailable: UIImagePickerControllerSourceTypeCamera]) {
         self.imagePickerVc.sourceType = sourceType;
@@ -287,7 +306,6 @@
     } else {
         NSLog(@"模拟器中无法打开照相机,请在真机中使用");
     }
-    }
 }
 
 - (void)imagePickerController:(UIImagePickerController*)picker didFinishPickingMediaWithInfo:(NSDictionary *)info {
@@ -346,7 +364,7 @@
     if (buttonIndex == 0) { // take photo / 去拍照
         [self takePhoto];
     } else if (buttonIndex == 1) {
-        [self pushImagePickerController];
+        [self pushTZImagePickerController];
     }
 }
 
@@ -379,7 +397,7 @@
 /// 用户点击了取消
 - (void)tz_imagePickerControllerDidCancel:(TZImagePickerController *)picker {
     // NSLog(@"cancel");
- }
+}
 
 // The picker should dismiss itself; when it dismissed these handle will be called.
 // If isOriginalPhoto is YES, user picked the original photo.