IOS 开发之swift中UIView的扩展使用的实例

import UIKit 
 
extension UIView 
{ 
  // MARK : 坐标尺寸 
   
  var origin:CGPoint { 
    get { 
      return self.frame.origin 
    } 
    set(newValue) { 
      var rect = self.frame 
      rect.origin = newValue 
      self.frame = rect 
    } 
  } 
   
  var size:CGSize { 
    get { 
      return self.frame.size 
    } 
    set(newValue) { 
      var rect = self.frame 
      rect.size = newValue 
      self.frame = rect 
    } 
  } 
   
  var left:CGFloat { 
    get { 
      return self.frame.origin.x 
    } 
    set(newValue) { 
      var rect = self.frame 
      rect.origin.x = newValue 
      self.frame = rect 
    } 
  } 
   
  var top:CGFloat { 
    get { 
      return self.frame.origin.y 
    } 
    set(newValue) { 
      var rect = self.frame 
      rect.origin.y = newValue 
      self.frame = rect 
    } 
  } 
   
  var right:CGFloat { 
    get { 
      return (self.frame.origin.x + self.frame.size.width) 
    } 
    set(newValue) { 
      var rect = self.frame 
      rect.origin.x = (newValue - self.frame.size.width) 
      self.frame = rect 
    } 
  } 
   
  var bottom:CGFloat { 
    get { 
      return (self.frame.origin.y + self.frame.size.height) 
    } 
    set(newValue) { 
      var rect = self.frame 
      rect.origin.y = (newValue - self.frame.size.height) 
      self.frame = rect 
    } 
  } 
   
  // MARK: - 位移 
   
  // 移动到指定中心点位置 
  func moveToPoint(point:CGPoint) -> Void 
  { 
    var center = self.center 
    center.x = point.x 
    center.y = point.y 
    self.center = center 
  } 
   
  // 缩放到指定大小 
  func scaleToSize(scale:CGFloat) -> Void 
  { 
    var rect = self.frame 
    rect.size.width *= scale 
    rect.size.height *= scale 
    self.frame = rect 
  } 
   
  // MARK: - 毛玻璃效果 
   
  // 毛玻璃 
  func effectViewWithAlpha(alpha:CGFloat) -> Void 
  { 
    let effect = UIBlurEffect.init(style: UIBlurEffectStyle.Light) 
    let effectView = UIVisualEffectView.init(effect: effect) 
    effectView.frame = self.bounds 
    effectView.alpha = alpha 
     
    self.addSubview(effectView) 
  } 
   
  // MARK: - 边框属性 
   
  // 圆角边框设置 
  func layer(radius radius:CGFloat, borderWidth:CGFloat, borderColor:UIColor) -> Void 
  { 
    if (0.0 < radius) 
    { 
      self.layer.cornerRadius = radius 
      self.layer.masksToBounds = true 
      self.clipsToBounds = true 
    } 
     
    if (0.0 < borderWidth) 
    { 
      self.layer.borderColor = borderColor.CGColor 
      self.layer.borderWidth = borderWidth 
    } 
  } 
   
  // MARK: - 翻转 
   
  // 旋转 旋转180度 M_PI 
  func viewTransformWithRotation(rotation:CGFloat) -> Void 
  { 
    self.transform = CGAffineTransformMakeRotation(rotation); 
  } 
   
  // 缩放 
  func viewScaleWithSize(size:CGFloat) -> Void 
  { 
    self.transform = CGAffineTransformScale(self.transform, size, size); 
  } 
   
  // 水平，或垂直翻转 
  func viewFlip(isHorizontal:Bool) -> Void 
  { 
    if (isHorizontal) 
    { 
      // 水平 
      self.transform = CGAffineTransformScale(self.transform, -1.0, 1.0); 
    } 
    else 
    { 
      // 垂直 
      self.transform = CGAffineTransformScale(self.transform, 1.0, -1.0); 
    } 
  } 
} 

let imageView = UIImageView.init(frame: CGRectMake(10.0, 10.0, 60.0, 60.0)) 
self.view.addSubview(imageView) 
     
imageView.image = UIImage(named: "header") 
     
imageView.backgroundColor = UIColor.colorRandom() 
     
imageView.left = 100.0 
imageView.top = 100.0 
imageView.size = CGSizeMake(100.0, 100.0) 
 
imageView.moveToPoint(CGPointMake(100.0, 100.0)) 
imageView.scaleToSize(2.0) 
 
imageView.effectViewWithAlpha(0.6) 
     
imageView.layer(radius: 3.0, borderWidth: 1.0, borderColor: UIColor.redColor()) 
     
imageView.viewFlip(false) 
     
imageView.viewTransformWithRotation(5.0)