本文以实例详细描述了Objective-C中常用的结构体NSRange,NSPoint,NSSize(CGSize),NSRect的定义及用法，具体如下所示：
1、NSRange：
NSRange的原型为
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typedef struct _NSRange {NSUInteger location;NSUInteger length;} NSRange; |
NSMakeRange的函数：
NS_INLINEz是内联函数
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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：
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//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：
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struct CGPoint {CGFloat x;CGFloat y;}; |
NSMakePoint函数：
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NS_INLINE NSPoint NSMakePoint(CGFloat x, CGFloat y) {NSPoint p;p.x = x;p.y = y;return p;} |
CGPointMake函数：
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CGPointMake(CGFloat x, CGFloat y){CGPoint p; p.x = x; p.y = y; return p;} |
使用方法：
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//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：
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struct CGSize {CGFloat width;CGFloat height;}; |
NSMakeSize函数：
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NS_INLINE NSSize NSMakeSize(CGFloat w, CGFloat h) {NSSize s;s.width = w;s.height = h;return s;} |
CGSizeMake函数：
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CGSizeMake(CGFloat width, CGFloat height){CGSize size; size.width = width; size.height = height; return size;} |
使用方法：
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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：
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struct CGRect {CGPoint origin;CGSize size;}; |
CGRectMake的函数：
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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：
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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
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//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 <a href="mailto:%@",str5" rel="external nofollow">%@",str5</a>); |
