【Objective-C】OC中NSNumber數(shù)字對(duì)象的常用處理方法

之前已經(jīng)學(xué)習(xí)過了基本數(shù)據(jù)類型。但是這些都市基本數(shù)據(jù)類型，它們不是對(duì)象。因此，不能向它們發(fā)送消息。

然后有時(shí)也需要將它們當(dāng)做對(duì)象來處理。不如，我們需要把基本數(shù)據(jù)類型放入到集合中（在Cocoa中集中只能存放對(duì)象，

無法存放基本數(shù)據(jù)類型），那么這時(shí)我們需要將基本類型轉(zhuǎn)換成數(shù)字對(duì)象.OC中提供了數(shù)據(jù)對(duì)象”NSNumber“可以將基本數(shù)據(jù)

類型”包裝“成對(duì)象,這樣我們就可以將基本數(shù)據(jù)類型來處理了

下面我們來看下具體使用例子：

// //  main.m //  FoundationDemo1 // //  Created by hmjiangqq on 14-1-23. //  Copyright (c) 2014年 hmjiangqq. All rights reserved. //  #import <Foundation/Foundation.h>  int main(int argc, const char * argv[]) {      @autoreleasepool {                  // insert code here...         NSLog(@"Hello, World!");         /*===========NSNumber=================*/          //創(chuàng)建一個(gè)NSNumber對(duì)象         NSNumber *monthNumber=[[NSNumber alloc]initWithInt:10];         NSNumber *lengthNumber=[[NSNumber alloc]initWithFloat:10.8];         NSLog(@"month =%@\n",monthNumber);         NSLog(@"length =%@\n",lengthNumber);         //還原成基本數(shù)據(jù)類型         int month=[monthNumber intValue];         float length=[lengthNumber floatValue];         NSLog(@"month=%d\n",month);         NSLog(@"length=%.1f\n",length);         /*=============NSString====================*/     }     return 0; }

- (id)initWithChar:(char)value; - (id)initWithUnsignedChar:(unsigned char)value; - (id)initWithShort:(short)value; - (id)initWithUnsignedShort:(unsigned short)value; - (id)initWithInt:(int)value; - (id)initWithUnsignedInt:(unsigned int)value; - (id)initWithLong:(long)value; - (id)initWithUnsignedLong:(unsigned long)value; - (id)initWithLongLong:(long long)value; - (id)initWithUnsignedLongLong:(unsigned long long)value; - (id)initWithFloat:(float)value; - (id)initWithDouble:(double)value; - (id)initWithBool:(BOOL)value; - (id)initWithInteger:(NSInteger)value NS_AVAILABLE(10_5, 2_0); - (id)initWithUnsignedInteger:(NSUInteger)value NS_AVAILABLE(10_5, 2_0);

- (char)charValue; - (unsigned char)unsignedCharValue; - (short)shortValue; - (unsigned short)unsignedShortValue; - (int)intValue; - (unsigned int)unsignedIntValue; - (long)longValue; - (unsigned long)unsignedLongValue; - (long long)longLongValue; - (unsigned long long)unsignedLongLongValue; - (float)floatValue; - (double)doubleValue; - (BOOL)boolValue; - (NSInteger)integerValue NS_AVAILABLE(10_5, 2_0); - (NSUInteger)unsignedIntegerValue NS_AVAILABLE(10_5, 2_0);

+ (NSNumber *)numberWithChar:(char)value; + (NSNumber *)numberWithUnsignedChar:(unsigned char)value; + (NSNumber *)numberWithShort:(short)value; + (NSNumber *)numberWithUnsignedShort:(unsigned short)value; + (NSNumber *)numberWithInt:(int)value; + (NSNumber *)numberWithUnsignedInt:(unsigned int)value; + (NSNumber *)numberWithLong:(long)value; + (NSNumber *)numberWithUnsignedLong:(unsigned long)value; + (NSNumber *)numberWithLongLong:(long long)value; + (NSNumber *)numberWithUnsignedLongLong:(unsigned long long)value; + (NSNumber *)numberWithFloat:(float)value; + (NSNumber *)numberWithDouble:(double)value; + (NSNumber *)numberWithBool:(BOOL)value; + (NSNumber *)numberWithInteger:(NSInteger)value NS_AVAILABLE(10_5, 2_0); + (NSNumber *)numberWithUnsignedInteger:(NSUInteger)value NS_AVAILABLE(10_5, 2_0);