添加闪光灯 review by洛克

@@ -311,7 +311,8 @@
     _torch_switch= NO;
     _btnTorch = [UIButton buttonWithType:UIButtonTypeCustom];
     _btnTorch.frame = CGRectMake(size.width - 4*icon_gap - 4*icon_size, size.height - 10 - icon_size, icon_size, icon_size);
-    [_btnTorch setImage:[UIImage imageNamed:@"flash_on"] forState:UIControlStateNormal];
+    [_btnTorch setImage:[UIImage imageNamed:@"flash_off"] forState:UIControlStateNormal];
+    [_btnTorch setImage:[UIImage imageNamed:@"flash_on"] forState:UIControlStateSelected];
     [_btnTorch addTarget:self action:@selector(clickTorch:) forControlEvents:UIControlEventTouchUpInside];
     [self.view addSubview:_btnTorch];
     
@@ -614,18 +615,28 @@
 -(void) clickTorch:(UIButton*) btn
 {
     if (_txLivePublisher) {
+        btn.selected = !btn.selected;
         _torch_switch = !_torch_switch;
-        if (![_txLivePublisher toggleTorch:_torch_switch]) {
-            _torch_switch = !_torch_switch;
-            [self toastTip:@"闪光灯启动失败"];
-        }
-        
-        if (_torch_switch == YES) {
-            [_btnTorch setImage:[UIImage imageNamed:@"flash_off"] forState:UIControlStateNormal];
-        }
-        else
-        {
-            [_btnTorch setImage:[UIImage imageNamed:@"flash_on"] forState:UIControlStateNormal];
+//        if (![_txLivePublisher toggleTorch:_torch_switch]) {
+//            _torch_switch = !_torch_switch;
+//            [self toastTip:@"闪光灯启动失败"];
+//        }
+        AVCaptureDevice *device = [AVCaptureDevice defaultDeviceWithMediaType:AVMediaTypeVideo];
+
+        if (_torch_switch) {
+            if ([device hasTorch]) {
+                [device lockForConfiguration:nil];
+                [device setTorchMode: AVCaptureTorchModeOn];
+                [device unlockForConfiguration];
+            }else {
+                [self toastTip:@"闪光灯启动失败"];
+            }
+        }else {
+            if ([device hasTorch]) {
+                [device lockForConfiguration:nil];
+                [device setTorchMode: AVCaptureTorchModeOff];
+                [device unlockForConfiguration];
+            }
         }
     }
 }