Objective-C中常用的結構體NSRange,NSPoint,NSSize(CGSize),NSRect

Objective-C中常用的結構體NSRange,NSPoint,NSSize(CGSize),NSRect

Objective-C中常用的結構體NSRange,NSPoint,NSSize(CGSize),NSRect

1 NSRange

NSRange 的原型為

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

NSMakeRange的函數

NS_INLINEz是內聯函數
     
     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表示的是范圍
    NSRange  range;
    range.location = 18;
    range.length = 34;
    
    NSLog(@"location is %zi",range.location);
    NSLog(@"length is %zi",range.length);
    
    //快速創建
    range = NSMakeRange(8, 10);
    NSLog(@"location is %zi",range.location);
    NSLog(@"length is %zi",range.length);
    
    //NSStringFromRange將上面的結構體轉化成字符串類型,打印出來
    
    NSString* str1 = NSStringFromRange(range);
    
    //%@是一個OC對象,range代表的是一個結構體,str是一個OC對象
    NSLog(@"rang is %@",str1);

NSPoint的原型

struct CGPoint {
     CGFloat x;
     CGFloat y;
     };

NSMakePoint函數

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

CGPointMake函數

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

//NSPoint指的是位置
    NSPoint point;
    
    //給結構體裡面的點進行賦值
    point.x = 10;
    point.y = 10;
    
    //快速創建點
    point = NSMakePoint(10, 18);
    
    //常見的是CGPointMake創建點的函數
    point = CGPointMake(29, 78);
    NSString* str2 = NSStringFromPoint(point);
    NSLog(@"point is %@",str2);

CGSize的原型

struct CGSize {
     CGFloat width;
     CGFloat height;
     };

NSMakeSize函數

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

CGSizeMake函數

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

 NSSize size;
   
    size.width = 100;
    size.height = 12;
    size = NSMakeSize(12, 12);
    size = CGSizeMake(11, 11);
    
    NSString* str3 = NSStringFromSize(size);
    NSLog(@"%@",str3);

CGRect的原型

struct CGRect {
     CGPoint origin;
     CGSize size;
     };

CGRectMake的函數

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函數

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;
     }

 //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;
    
    //快速創建方法
    rect = CGRectMake(12, 12, 12, 12);
    rect = NSMakeRect(11, 11, 11, 11);
    
    //轉化成字符串打印出來
    NSString* str5 = NSStringFromRect(rect);
    NSLog(@"rect is %@",str5);