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);