Objective-C中经常使用的结构体NSRange,NSPoint,NSSize(CGSize),NSRect

Objective-C中经常使用的结构体NSRange,NSPoint,NSSize(CGSize),NSRect

1   NSRange

NSRange 的原型为

typedef struct _NSRange {
     NSUInteger location;
     NSUInteger length;
     } NSRange;

NSMakeRange的函数

NS_INLINEz是内联函数

     typedef NSRange *NSRangePointer;

     NS_INLINE NSRange NSMakeRange(NSUInteger loc, NSUInteger len) {
     NSRange r;
     r.location = loc;
     r.length = len;
     return r;
     }

用法

 //NSRange表示的是范围
    NSRange  range;
    range.location = 18;
    range.length = 34;

    NSLog(@"location is %zi",range.location);
    NSLog(@"length is %zi",range.length);

    //高速创建
    range = NSMakeRange(8, 10);
    NSLog(@"location is %zi",range.location);
    NSLog(@"length is %zi",range.length);

    //NSStringFromRange将上面的结构体转化成字符串类型,打印出来

    NSString* str1 = NSStringFromRange(range);

    //%@是一个OC对象,range代表的是一个结构体,str是一个OC对象
    NSLog(@"rang is %@",str1);

2  NSPoint

NSPoint的原型

struct CGPoint {
     CGFloat x;
     CGFloat y;
     };

NSMakePoint函数

NS_INLINE NSPoint NSMakePoint(CGFloat x, CGFloat y) {
     NSPoint p;
     p.x = x;
     p.y = y;
     return p;
     }

CGPointMake函数

CGPointMake(CGFloat x, CGFloat y)
     {
     CGPoint p; p.x = x; p.y = y; return p;
     }

用法

//NSPoint指的是位置
    NSPoint point;

    //给结构体里面的点进行赋值
    point.x = 10;
    point.y = 10;

    //高速创建点
    point = NSMakePoint(10, 18);

    //常见的是CGPointMake创建点的函数
    point = CGPointMake(29, 78);
    NSString* str2 = NSStringFromPoint(point);
    NSLog(@"point is %@",str2);

3  CGSize

CGSize的原型

struct CGSize {
     CGFloat width;
     CGFloat height;
     };

NSMakeSize函数

NS_INLINE NSSize NSMakeSize(CGFloat w, CGFloat h) {
     NSSize s;
     s.width = w;
     s.height = h;
     return s;
     }

CGSizeMake函数

CGSizeMake(CGFloat width, CGFloat height)
     {
     CGSize size; size.width = width; size.height = height; return size;
     }

用法

 NSSize size;

    size.width = 100;
    size.height = 12;
    size = NSMakeSize(12, 12);
    size = CGSizeMake(11, 11);

    NSString* str3 = NSStringFromSize(size);
    NSLog(@"%@",str3);

4 CGRect

CGRect的原型

struct CGRect {
     CGPoint origin;
     CGSize size;
     };

CGRectMake的函数

CGRectMake(CGFloat x, CGFloat y, CGFloat width, CGFloat height)
     {
     CGRect rect;
     rect.origin.x = x; rect.origin.y = y;
     rect.size.width = width; rect.size.height = height;
     return rect;
     }

NSMakeRect函数

NS_INLINE NSRect NSMakeRect(CGFloat x, CGFloat y, CGFloat w, CGFloat h) {
     NSRect r;
     r.origin.x = x;
     r.origin.y = y;
     r.size.width = w;
     r.size.height = h;
     return r;
     }

用法

 //既包括了尺寸大小和位置
    NSRect rect;
    rect.origin.x = 12;
    rect.origin.y = 14;
    rect.size.width = 12;
    rect.size.height = 15;

    //高速创建方法
    rect = CGRectMake(12, 12, 12, 12);
    rect = NSMakeRect(11, 11, 11, 11);

    //转化成字符串打印出来
    NSString* str5 = NSStringFromRect(rect);
    NSLog(@"rect is %@",str5);