Objective-C中經常使用的構造體NSRange,NSPoint,NSSize(CGSize),NSRect實例剖析。本站提示廣大學習愛好者:(Objective-C中經常使用的構造體NSRange,NSPoint,NSSize(CGSize),NSRect實例剖析)文章只能為提供參考,不一定能成為您想要的結果。以下是Objective-C中經常使用的構造體NSRange,NSPoint,NSSize(CGSize),NSRect實例剖析正文
本文以實例具體描寫了Objective-C中經常使用的構造體NSRange,NSPoint,NSSize(CGSize),NSRect的界說及用法,詳細以下所示:
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; }
應用辦法:
//NSRange表現的是規模 NSRange range; range.location = 18; range.length = 34; NSLog(@"location is %zi",range.location); NSLog(@"length is %zi",range.length); //疾速創立 range = NSMakeRange(8, 10); NSLog(@"location is %zi",range.location); NSLog(@"length is %zi",range.length); //NSStringFromRange將下面的構造體轉化成字符串類型,打印出來 NSString* str1 = NSStringFromRange(range); //%@是一個OC對象,range代表的是一個構造體,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; }
應用辦法:
//NSPoint指的是地位 NSPoint point; //給構造體外面的點停止賦值 point.x = 10; point.y = 10; //疾速創立點 point = NSMakePoint(10, 18); //罕見的是CGPointMake創立點的函數 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; }
應用辦法:
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; }
應用辦法
//既包括了尺寸年夜小和地位 NSRect rect; rect.origin.x = 12; rect.origin.y = 14; rect.size.width = 12; rect.size.height = 15; //疾速創立辦法 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);