iOS

前言

• 结构体 这个结构体用来表示事物的坐标点和宽高度。

  	typedef CGRect NSRect;
  	
  	struct CGRect {
  		CGPoint origin;
  		CGSize size;
  	};
  	
  	typedef struct CGRect CGRect;
  

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
		NSRect rect1;
		rect1.origin.x = 6;
		rect1.origin.y = 1;
		rect1.size.width = 1;
		rect1.size.height = 6;
		    
		// 定义时直接赋值，或者  NSRect rect2 = {{7, 2}, {2, 7}};
		NSRect rect2 = {7, 2, 2, 7};
		
		// 给指定成员赋值
		NSRect rect3 = {.size.height = 8, .size.width = 3, .origin.y = 3, .origin.x = 8};
		
		// 使用函数赋值
		NSRect rect4 = NSMakeRect(9, 4, 4, 9);
		
		// 使用等价的结构体定义，等价于 CGRect rect5 = CGRectMake(10, 5, 5, 10);
		NSRect rect5 = CGRectMake(10, 5, 5, 10);
		    
	// NSRect 结构体变量值的调用
	    
		NSLog(@"rect1: %.0f, %.0f, %.0f, %.0f", rect1.origin.x, rect1.origin.y, rect1.size.width, rect1.size.height);
		NSLog(@"rect2: %.0f, %.0f, %.0f, %.0f", rect2.origin.x, rect2.origin.y, rect2.size.width, rect2.size.height);
		NSLog(@"rect3: %.0f, %.0f, %.0f, %.0f", rect3.origin.x, rect3.origin.y, rect3.size.width, rect3.size.height);
		NSLog(@"rect4: %.0f, %.0f, %.0f, %.0f", rect4.origin.x, rect4.origin.y, rect4.size.width, rect4.size.height);
		NSLog(@"rect5: %.0f, %.0f, %.0f, %.0f", rect5.origin.x, rect5.origin.y, rect5.size.width, rect5.size.height);

2、NSRect 与 NSString 的相互转换

	// NSRect 转 NSString
	NSString *stringFronRect = NSStringFromRect(rect5);
	  	
	// NSString 转 NSRect
	NSRect rect6 = NSRectFromString(stringFronRect);