11.NSNumber

最新推荐文章于 2020-12-19 05:53:23 发布

残灬月

最新推荐文章于 2020-12-19 05:53:23 发布

阅读量461

点赞数

分类专栏： UIKit Object-C

本文链接：https://blog.youkuaiyun.com/u012665008/article/details/51496211

版权

UIKit 同时被 2 个专栏收录

12 篇文章

订阅专栏

Object-C

10 篇文章

订阅专栏

NSNumber

[TOC]
- NSNumber 是类,可以将基本数据类型包装起来，形成一个对象。

初始化

    NSNumber *num = [[NSNumber alloc] initWithInt:1000];
- (NSNumber *)initWithChar:(char)value 
- (NSNumber *)initWithUnsignedChar:(unsigned char)value
- (NSNumber *)initWithShort:(short)value 
- (NSNumber *)initWithUnsignedShort:(unsigned short)value
- (NSNumber *)initWithInt:(int)value 
- (NSNumber *)initWithUnsignedInt:(unsigned int)value
- (NSNumber *)initWithLong:(long)value
- (NSNumber *)initWithUnsignedLong:(unsigned long)value
- (NSNumber *)initWithLongLong:(long long)value 
- (NSNumber *)initWithUnsignedLongLong:(unsigned long long)value 
- (NSNumber *)initWithFloat:(float)value
- (NSNumber *)initWithDouble:(double)value
- (NSNumber *)initWithBool:(BOOL)value 
- (NSNumber *)initWithInteger:(NSInteger)value
- (NSNumber *)initWithUnsignedInteger:(NSUInteger)value

转换

    NSNumber *num = [NSNumber numberWithChar:'a'];
+ (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
+ (NSNumber *)numberWithUnsignedInteger:(NSUInteger)value

取值

    NSLog(@"%d", [num intValue]);
- (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
- (NSUInteger)unsignedIntegerValue

应用

//比较
- (NSComparisonResult)compare:(NSNumber *)otherNumber;

//是否相同
- (BOOL)isEqualToNumber:(NSNumber *)number;

//重写
- (NSString *)descriptionWithLocale:(nullable id)locale;