Objective-C中常用的结构体NSRange,NSPoint,NSSize(CGSize),NSRect

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);