ios - 相机对焦ios

我有崩溃消息:

* Terminating app due to uncaught exception 'NSInvalidArgumentException', reason: 'Setting focusPointOfInterest is not supported by this device. Use isFocusPointOfInterestSupported'

代码后:

-(void)touchesBeganNSSet *)touches withEventUIEvent *)event
{
    [device setFocusPointOfInterest:CGPointMake(100, 100)];
}

有没有办法像相机胶卷那样进行对焦？

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Best Answer-推荐答案

答案的组合，但这应该可以帮助您。

您需要将触摸点从触摸开始或触摸手势转换为 0-1 比例。

所以，检查你的设备是否有焦点，然后转换点:

-(void)touchesBeganNSSet *)touches withEventUIEvent *)event
{
    // get device reference...

    if ([device isFocusPointOfInterestSupported]) {
        CGPoint point = [touch locationInView:self.myCameraView];
        float newX = point.x / self.myCameraView.frame.size.width;
        float newY = point.y / self.myCameraView.frame.size.height;
        [device setFocusPointOfInterest:CGPointMake(newX, newY)];
    }
    else {
        // Focus not supported
    }
}

关于ios - 相机对焦ios，我们在Stack Overflow上找到一个类似的问题： https://stackoverflow.com/questions/15366550/