2015年12月6日.
在Storyboard中绘制已经定义的UIView
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在FaceView加入@IBDesignable在改变FaceView的相关属性时Storyboard会同步现实出来
FaceView1.png
Storyboard1.png
另FaceView中自定义的属性,在Storyboard中可设定
-
在FaceView自定义的属性前,加入@IBInspectable即可在Utilites的Attributs inspector中直接进行修改
-
未加@IBInspectable时是这样的
Attributs inspector1.png
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添加@IBInspectable后是这样的,多了LineWidth,Color,Scale三个属性,可直接在此处进行修改
@IBInspectable2.png
Attributs inspector2.png
如何限定需加载值的范围
- 在本DEMO中,微笑指数被设定在0 -- 100,0 = vary sad,100 = ecstatic 但如果用户输入时,超过了100或者小于0了,怎么办?
- 可以用min,max代码来实现
var happiness: Int = 75 { //Model 0 = vary sad, 100 = ecstatic
didSet {
happiness = min(max(happiness, 0),100) //将happiness的值保持在0-100之间
print("happiness = \(happiness)")
updateUI() //如果改变了Model则对UI进行更新
}
}
其中happiness = min(max(happiness, 0),100)函数利用取大和取小得方法,限定了数值只能保持在0到100之间,即使用户输入2000,happiness也会取100,输入-2000也只会取0
添加手势
- 添加手势有两种方法
1.可直接在View的Outlet代码中实现
@IBOutlet weak var faceView: FaceView! {
didSet {
faceView.dataSource = self //加载dataSource
faceView.addGestureRecognizer(UIPinchGestureRecognizer(target: faceView, action: "scale:")) //直接添加代码实现手势方法,也可通过在Storyboard添加手势识别器实现(下方@IBAction func changeHappiness(gesture: UIPanGestureRecognizer)).
}
}
2.可通过在Storyboard添加手势识别器实现
在UI控件中能找到多种手势识别器,直接将其拖入Storyboard中并创建Action用代码实现即可
Storyboard.png
private struct Constants {
static let HappinessGestureScale: CGFloat = 4
}
@IBAction func changeHappiness(gesture: UIPanGestureRecognizer) {
switch gesture.state {
case .Ended: fallthrough
case .Changed:
let translation = gesture.translationInView(faceView)
let happinessChange = -Int(translation.y / Constants.HappinessGestureScale)
//此处除以HappinessGestureScale = 4 用来控制拖动时笑脸变化的程度,当数字为1时即为拖动了多少y坐标笑脸的y坐标就变化多少
if happinessChange != 0 {
happiness += happinessChange
gesture.setTranslation(CGPointZero, inView: faceView)
//将translation坐标重置为(0,0)
}
default: break
}
}
