調整UILabel的質量不會造成損失

Question

我希望能夠使用UIPinchGesture調整UILabel的大小，不會造成質量損失。目前我可以調整它，但它變得非常模糊。

這裏是我的代碼

label = UILabel(frame:CGRectMake(0,100,300,50)) 
    label.text = "Hellow World" 
    label.textColor = UIColor.blueColor() 
    label.font = UIFont(name: "HelveticaNeue-Bold", size: self.label.frame.height) 
    self.view.addSubview(label) 

    self.resizeRecognizer = UIPinchGestureRecognizer(target: self, action: Selector("handleScale:")) 
    self.rotateRecognizer = UIRotationGestureRecognizer(target: self, action: Selector("handleRotate:")) 

    label.userInteractionEnabled = true 
    label.addGestureRecognizer(self.resizeRecognizer) 

這是我的手勢識別器

func handleScale(recognizer: UIPinchGestureRecognizer) 
{ 
    recognizer.view!.transform = CGAffineTransformScale(recognizer.view!.transform, 
     recognizer.scale, recognizer.scale) 
    recognizer.scale = 1 
     recognizer.view!.frame = CGRectMake(recognizer.view!.frame.minX, recognizer.view!.frame.minY, recognizer.view!.frame.width, recognizer.view!.frame.height) 

    println(recognizer.view!.frame) 
    println(self.label.font.fontWithSize(recognizer.view!.frame.height)) 
    println(self.label.frame) 

} 

什麼需要在這裏發生的是，當標籤幀進行縮放，文字的大小也需要爲改變好。 所以我改變框的字體大小應改變label.font = UIFont(name: "HelveticaNeue-Bold", size: self.label.frame.height)

這就是我來

<UICTFont: 0x7ffb39e17ba0> font-family: "Helvetica Neue"; font-weight: bold; font-style: normal; font-size: 578.77pt 
<UICTFont: 0x7ffb3ca03ed0> font-family: "Helvetica Neue"; font-weight: bold; font-style: normal; font-size: 594.29pt 

字體大小也調整爲框架調整，我試圖做的是從字體大小開始，它呈現清脆。 我認爲正在進行的是，實際的標籤不會再次呈現。 有人知道發生了什麼或如何解決？

編輯：

在上面的文字是什麼，我想重新調整後的情況發生，在底部的文字是發生了什麼事

我實現了，這是我創建的方式一個新的標籤與舊標籤的大小，然後將其添加到子視圖，我希望能夠在重新縮放時做到這一點，如果這是有意義的

Answer 1

創建一個UILabel的字體大小適合您的maxiumum放大規模。然後使用transform屬性將其縮放到其初始大小。另外，將adjustsFontSizeToFitWidth設置爲false。

Answer 2

我認爲你沒有更新字體大小，fontWithSize返回一個你應該分配給標籤的字體。

func handleScale(recognizer: UIPinchGestureRecognizer) 
{ 
    self.test.transform = CGAffineTransformScale(self.test.transform, recognizer.scale, recognizer.scale) 
    recognizer.scale = 1 


    println(recognizer.view!.frame) 


    self.test.font = self.test.font.fontWithSize(recognizer.view!.frame.height) 
    println(self.test.font) 
    println(self.test.frame) 


} 

Answer 3

我已經複製你的代碼，並確實發現，上面的代碼只是更新標籤框架。實際上，字體大小未按照您的預期更新。

按照下面的代碼，你可以清楚地看到不同之處。

import UIKit 

class ViewController: UIViewController { 

    var resizeRecognizer: UIPinchGestureRecognizer! 
    var rotateRecognizer: UIRotationGestureRecognizer! 
    var label: UILabel! 

    override func viewDidLoad() { 
     super.viewDidLoad() 

     label = UILabel(frame:CGRectMake(50,300,300,50)) 
     label.text = "Hello World" 
     label.textColor = UIColor.blueColor() 
     label.font = UIFont(name: "HelveticaNeue-Bold", size: 18) 
     label.backgroundColor = UIColor.darkGrayColor() 
     self.view.addSubview(label) 

     self.resizeRecognizer = UIPinchGestureRecognizer() 
     self.resizeRecognizer.addTarget(self, action: Selector("handleScale:")) 
     label.userInteractionEnabled = true 
     label.addGestureRecognizer(self.resizeRecognizer) 
    } 

    func handleScale(recognizer: UIPinchGestureRecognizer) 
    { 
     recognizer.view!.transform = CGAffineTransformScale(recognizer.view!.transform, 
      recognizer.scale, recognizer.scale) 
     recognizer.scale = 1 
     recognizer.view!.frame = CGRectMake(0, recognizer.view!.frame.minY, recognizer.view!.frame.width, recognizer.view!.frame.height) 

     label.frame = CGRectMake(recognizer.view!.frame.minX, recognizer.view!.frame.minY, recognizer.view!.frame.width, recognizer.view!.frame.height) 
     label.font = UIFont(name: self.label.font.fontName, size: recognizer.view!.frame.height) 

     // Or Suggested solution 
     var fontSize = CGFloat(recognizer.view!.frame.height/2) 

     label.font = UIFont(name: self.label.font.fontName, size: recognizer.view!.frame.height - fontSize) 

    } 
} 

Answer 4

試試這個

import UIKit 

class ViewController: UIViewController { 

let label = UILabel() 
let pinchRecognizer = UIPinchGestureRecognizer() 

override func viewDidLoad() { 
    super.viewDidLoad() 

    label.text = "first line\nsecond line" 
    label.textAlignment = NSTextAlignment.Center 
    label.font = UIFont(name: "Menlo-Regular", size: 25) 
    label.numberOfLines = 0 
    label.sizeToFit() 
    label.center = self.view.center 
    self.view.addSubview(label) 

    pinchRecognizer.addTarget(self, action: "changeFontSize") 
    self.view.addGestureRecognizer(pinchRecognizer) 
} 

func changeFontSize() { 

    if pinchRecognizer.state == .Began { 

     pinchRecognizer.scale = label.font.pointSize * 0.1 
    } 

    if 1 <= pinchRecognizer.scale && pinchRecognizer.scale <= 5 { 

     let cent = label.center 
     label.font = UIFont(name: label.font.fontName, size: pinchRecognizer.scale * 10) 
     label.frame.size.width = 999 
     label.numberOfLines = 2 
     label.sizeToFit() 
     label.center = cent 
    } 
} 


}