手电筒默认关闭

Question

我有一些代码附带一个手电筒按钮，可以打开和关闭，但它默认开始启动，这当然不应该。你们对如何轻松改变这个有什么想法吗？

if (!FrontCamera) {

    if ([backCamera hasFlash]){
        [backCamera lockForConfiguration:nil];
        if (self.flashToggleButton.selected)
            [backCamera setFlashMode:AVCaptureFlashModeOn];
        else
            [backCamera setFlashMode:AVCaptureFlashModeOff];
        [backCamera unlockForConfiguration];

        self.flashToggleButton.selected = NO;
    }
    else{
        if ([backCamera isFlashModeSupported:AVCaptureFlashModeOff]) {
            [backCamera lockForConfiguration:nil];
            [backCamera setFlashMode:AVCaptureFlashModeOff];
            [backCamera unlockForConfiguration];
        }
        [self.flashToggleButton setEnabled:NO];
    }

    NSError *error = nil;
    AVCaptureDeviceInput *input = [AVCaptureDeviceInput deviceInputWithDevice:backCamera error:&error];
    if (!input) {
        NSLog(@"ERROR: trying to open camera: %@", error);
    }
    [session addInput:input];
}

if (FrontCamera) {
    [self.flashToggleButton setEnabled:NO];
    NSError *error = nil;
    AVCaptureDeviceInput *input = [AVCaptureDeviceInput deviceInputWithDevice:frontCamera error:&error];
    if (!input) {
        NSLog(@"ERROR: trying to open camera: %@", error);
    }
    [session addInput:input];
}

Answer 1

您使用按钮的selected状态吗？如果是这样，请尝试：

self.flashToggleButton.selected = NO;