Objective-C中經常使用的結構體NSRange,NSPoint,NSSize(CGSize),NSRect

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Objective-C中經常使用的結構體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是內嵌函式          typedef NSRange *NSRangePointer;          NS_INLINE NSRange NSMakeRange(NSUInteger loc, NSUInteger len) {     NSRange r;     r.location = loc;     r.length = len;     return r;     }

用法

 //NSRange表示的是範圍    NSRange  range;    range.location = 18;    range.length = 34;        NSLog(@"location is %zi",range.location);    NSLog(@"length is %zi",range.length);        //高速建立    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串類型,列印出來        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);

2  NSPoint

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;     }

用法

//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;        //高速建立點    point = NSMakePoint(10, 18);        //常見的是CGPointMake建立點的函數    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;     }

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;     }

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;        //高速建立方法    rect = CGRectMake(12, 12, 12, 12);    rect = NSMakeRect(11, 11, 11, 11);        //轉化成字串列印出來    NSString* str5 = NSStringFromRect(rect);    NSLog(@"rect is %@",str5);

Objective-C中經常使用的結構體NSRange,NSPoint,NSSize(CGSize),NSRect