本文以實例詳細描述了Objective-C中常用的結構體NSRange,NSPoint,NSSize(CGSize),NSRect的定義及用法，具體如下所示：
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);
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;}使用方法：
//NSPoint指的是位置NSPoint point;//給結構體里面的點進行賦值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);
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;}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;}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);
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