iOS 要定义自己的导航栏button样式Button Image 执行出彩是不一样的与原来的颜色 －解

在相机闪光灯，在导航栏中自己定义“闪”样式。点击变换的图像期望，但一直没有变化。原来是该条款的Global Tint颜色。因此，系统会自己主动改变图片的颜色Global Tint颜色。

解，设置图片。参加：imageWithRenderingMode:UIImageRenderingModeAlwaysOriginal

源代码：

- (void) setFlashOn:(BOOL)isOn
{
    if (self.captureDevice.hasFlash) {
        UIImage* flashlIcon;
        [self.captureDevice lockForConfiguration:nil]; //you must lock before setting torch mode
        if (isOn) {
            NSLog(@"set flash on");
            [self.captureDevice setFlashMode:AVCaptureFlashModeOn];
            flashlIcon = [UIImage imageNamed:@"flash_on"];
        }
        else{
            NSLog(@"set flash off");
            [self.captureDevice setFlashMode:AVCaptureFlashModeOff];
            flashlIcon = [UIImage imageNamed:@"flash_off"];
        }
        [self.captureDevice unlockForConfiguration];
        [self.navigationItem.rightBarButtonItem setImage:[flashlIcon imageWithRenderingMode:UIImageRenderingModeAlwaysOriginal]];
    }
    else{
        NSLog(@"Sorry, this device doesn't have flash.");
    }
}

http://stackoverflow.com/questions/21252194/navigation-bar-button-item-image-color-is-different-when-design-through-xib-of-x