我在使用swift中的objective-c block等效尝试时遇到了麻烦

Question

这是objective-c代码：

options.onPan = ^(MDCPanState *state){
    if (state.thresholdRatio == 1.f && state.direction == MDCSwipeDirectionLeft) {
        NSLog(@"Let go now to delete the photo!");
    }
};

夫特：

   var options = MDCSwipeToChooseViewOptions()
        options.delegate = self
        options.likedText = "Keep"
        options.likedColor = UIColor.blueColor()
        options.nopeText = "Delete"

        options.onPan = { (state: MDCPanState) in
            if state.thresholdRatio == 1.0 && state.direction == MDCSwipeDirection.Left {
                println("Let go now to delete the photo!");
            }
        }

这是一个错误：

＆＃39;（MDCPanState） - ＆gt; （MDCPanState） - ＆gt; $ T2＆＃39;不能转换为＆＃39; MDCPanState＆＃39;

非常感谢一些帮助，谢谢。

Answer 1

我不是百分之百，因为我现在附近没有XCode，但我相信你需要改变这个：

options.onPan = { (state: MDCPanState) in
        if state.thresholdRatio == 1.0 && state.direction == MDCSwipeDirection.Left {
            println("Let go now to delete the photo!");
        }

到此：

options.onPan = { (state: MDCPanState!) -> Void in
        if state.thresholdRatio == 1.0 && state.direction == MDCSwipeDirection.Left {
            println("Let go now to delete the photo!");
        }