常用结构体

//1.创建一个NSRange结构体 表示范围
        NSRange range = {4,5};
        NSRange range2 = NSMakeRange(4, 5);
        NSString * strRange = NSStringFromRange(range);
        NSLog(@"strRange %@",strRange);
        
        //2.NSSize 等同于 CGSize 有两个值组成 weight表示宽度 height高度
        NSSize  size = {21,19};
        NSSize  size2 = NSMakeSize(21, 19);
        NSString *strSize =  NSStringFromSize(size2);
        NSLog(@"strSize %@",strSize);
        
        //3.NSPoint 等同CGPoint 表示一个点的坐标位置
        NSPoint point = {20,40};
        NSPoint point2 = NSMakePoint(20, 40);
        NSString * strPoint = NSStringFromPoint(point);
        NSLog(@"strPoint %@",strPoint);
        
        //4.NSRect
        NSRect rect = {40,60,100,200};
        NSRect rect2 = NSMakeRect(0, 10, 100, 100);
        NSString * strRect = NSStringFromRect(rect);
        NSLog(@"strRect %@",strRect);