ios - 如何使用 MKMapView.gestureRecognizers 访问特定的 UIGestureRecognizer

Question

我在 viewDidLoad 方法中添加了一个 UILongPressGestureRecognizer:

var uilpgr = UILongPressGestureRecognizer(target: sMapView, action: "longPressDetected:")
    uilpgr.minimumPressDuration = 1
    sMapView.addGestureRecognizer(uilpgr)

我正在尝试在我的处理程序中禁用它。这是我唯一的手势识别器，现在我正在尝试:

            var recognizerList = sMapView.gestureRecognizers
            var recognizer = uilpgrList[0] as! UILongPressGestureRecognizer
            recognizer.enabled = false

我收到错误:“无法使用‘Int’类型的索引为 [AnyObject] 的值添加下标？”

Answer 1

我没有考虑到 sMapView.gestureRecognizers 返回的数组是可选的这一事实。

还在初始化中发现了一个错误。

当前工作代码:

初始化: var uilpgr = UILongPressGestureRecognizer(目标: self, 操作: "longPressDetected:") uilpgr.minimumPressDuration = 1 sMapView.addGestureRecognizer(uilpgr)

禁用:

var recognizer = sMapView.gestureRecognizers![0] as! UILongPressGestureRecognizer
recognized.enabled = false

启用:

var recognizer = sMapView.gestureRecognizers![0] as! UILongPressGestureRecognizer
recognized.enabled = true