本节要点：红色标记 需要记下来

1   NSRange

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;

  }

使用方法

//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);

 

  //快速创建

  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;

     }

使用方法

//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;

 

  //快速创建点

  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;

     }

使用方法

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;

  }

使用方法

//既包含了尺寸大小和位置

  NSRect rect;

  rect.origin.x = 12;

  rect.origin.y = 14;

  rect.size.width = 12;

  rect.size.height = 15;

 

  //快速创建方法

  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);