前言

• 结构体，这个结构体用来表示事物的坐标点和宽高度。

      public typealias NSRect = CGRect
  
      public struct CGRect {
          public var origin: CGPoint
          public var size: CGSize
          public init()
          public init(origin: CGPoint, size: CGSize)
      }

1、NSRect 结构体变量的创建与调用

    // NSRect 结构体变量的创建与赋值
        
        // 先定义变量，再赋值
        var rect1:NSRect = NSRect()                                                 
        rect1.origin.x = 6;
        rect1.origin.y = 1;
        rect1.size.width = 1;
        rect1.size.height = 6;
        
        // Int 型值
        let rect2:NSRect = NSRect(x: 1, y: 2, width: 5, height: 6)                  
        
        // Double 型值
        let rect3:NSRect = NSRect(x: 2.1, y: 3.2, width: 6.3, height: 7.4)          
        
        // CGFloat 型值
        let rect4:NSRect = NSRect(x: 3.1, y: 4.2, width: 7.3, height: 8.4)          
        
        // 由方法创建
        let rect5:NSRect = NSMakeRect(4.1, 5.2, 6.3, 7.4)                           
        
        // 由方法创建
        let rect6:NSRect = CGRectMake(5.1, 6.2, 7.3, 8.4)                           
    
    // NSRect 结构体变量值的调用
    
        print("\(rect1.origin.x), \(rect1.origin.y), \(rect1.size.width), \(rect1.size.height)")

2、NSRect 与 String 的相互转换

    let rect1:NSRect = NSMakeRect(4.1, 5.2, 6.3, 7.4)
    
    // NSRect 转 String
    let string:String = NSStringFromRect(rect1);
        
    // String 转 NSRect
    let rect:NSRect = NSRectFromString(string);