CALayer 判斷是否點選hitTest
CALayer并不關心任何響應鍊事件,是以不能直接處理觸摸事件或者手勢。但是它有一系列的方法幫你處理事件:
containsPoint:
和
hitTest:
。
下來看看這兩個方法怎麼使用 。
首先來看
containsPoint
, 首先在界面上拖一個UIView出來 , 在上面放兩份layer 。
ly1.frame = CGRectMake(, , , )
ly1.backgroundColor = UIColor.redColor().CGColor
v1.layer.addSublayer(ly1)
ly2.frame = CGRectMake(, , , )
ly2.backgroundColor = UIColor.redColor().CGColor
v1.layer.addSublayer(ly2)
大概就這樣的
然後重寫
touchesBegan
方法
override func touchesBegan(touches: Set<UITouch>, withEvent event: UIEvent?) {
var p = (touches as NSSet).anyObject()?.locationInView(v1);
p = v1.layer.convertPoint(p!, fromLayer: v1.layer)
//方法
if v1.layer.containsPoint(p!) {
p = ly1.convertPoint(p!, fromLayer: v1.layer)
if ly1.containsPoint(p!){
let alert = UIAlertView(title: "點選了", message: "第一個被點選了", delegate: nil, cancelButtonTitle: "OK")
alert.show()
}
p = ly2.convertPoint(p!, fromLayer: v1.layer)
if ly2.containsPoint(p!){
let alert = UIAlertView(title: "點選了", message: "第二個被點選了", delegate: nil, cancelButtonTitle: "OK")
alert.show()
}
}
}
效果:
就這樣的效果 , 别的Layer 可以暫時不管
hitTest
方法
//方法2
let p1 = (touches as NSSet).anyObject()?.locationInView(self.v1);
//p1 = v1.layer.convertPoint(p1!, fromLayer: v1.layer)
let clickLayer = ly3.hitTest(p1!)
print(ly3.frame)
if(clickLayer == ly3){
let alert = UIAlertView(title: "點選了", message: "第三個被點選了", delegate: nil, cancelButtonTitle: "OK")
alert.show()
}
let anoLayer = ly4.hitTest(p1!)
if(anoLayer == ly4){
let alert = UIAlertView(title: "點選了", message: "點選了小鳥", delegate: nil, cancelButtonTitle: "OK")
alert.show()
}
這個方法友善多了,代碼量少多了 , 以後就用這個了。。。
看看效果
contensRect
前面講過者個屬性是用來裁剪圖檔的 , 用一個示例來看看這個屬性的用法
這個圖
先在界面上拖寫view
拖到控制器
@IBOutlet var digitViews: [UIView]!
一個數組 。
img = UIImage(named: "sz")!
for item in digitViews{
item.layer.contents = UIImage(named: "sz")!.CGImage
item.layer.contentsRect = CGRectMake(, , , );
item.layer.contentsGravity = kCAGravityResizeAspect;
}
let timer = NSTimer.scheduledTimerWithTimeInterval(, target: self, selector: "showTime", userInfo: nil, repeats: true)
timer.fire()
func showTime(){
let calendar = NSCalendar.currentCalendar()
// let unitFlags =
let comp = calendar.components(NSCalendarUnit.Second , fromDate: NSDate())
setDigit(comp.second%,ly: digitViews[])
setDigit(comp.second/, ly: digitViews[])
let comp1 = calendar.components(NSCalendarUnit.Minute , fromDate: NSDate())
setDigit(comp1.minute%,ly: digitViews[])
setDigit(comp1.minute/, ly: digitViews[])
let comp2 = calendar.components(NSCalendarUnit.Hour , fromDate: NSDate())
setDigit(comp2.hour%,ly: digitViews[])
setDigit(comp2.hour/, ly: digitViews[])
}
func setDigit(t:Int,ly:UIView){
ly.layer.contentsRect = CGRectMake(*CGFloat(t),,, );
}
效果大家也看到了 , 就是上面圖下面的那個電子表
源代碼:https://github.com/smalldu/SwiftStudy
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