ios - Swift 编译器错误 : Cannot invoke 'lockForConfiguration' with an argument list of type '(() -> ())'

Question

这是 Swift 2。我似乎找不到任何相关信息。我收到错误

Cannot invoke 'lockForConfiguration' with an argument list of type '(() -> ())'

这里是第二行。

if let device = captureDevice {
            device.lockForConfiguration() {
                device.videoZoomFactor = 1.0 + CGFloat(ratioValue)
                device.unlockForConfiguration()
        }
        print(ratioValue)
    }

Answer 1

在 Swift 2 中，lockForConfiguration 方法不接受任何参数，而是可以抛出一个 NSError。您应该将其包装在 do-try-catch 语句中。

do {
    try device.lockForConfiguration()
} catch {
    // handle error
    return
}

// When this point is reached, we can be sure that the locking succeeded
device.videoZoomFactor = 1.0 + CGFloat(ratioValue)
device.unlockForConfiguration()