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);