@10这样的数据在OC中处理

objective-c 中数据类型之五 数值类（NSNumber及NSNumberFormatter）

// 聊聊NSNumber， NSNumber可以封装c中基本数据类型 char，int，long，float，BOOL，NSInteger，CGFloat等。
NSNumber *num = [NSNumber numberWithChar:'a'];
NSLog(@"%@", num); // 97

num = [NSNumber numberWithInteger:97];  
num = [NSNumber numberWithFloat:97.0];  
num = [NSNumber numberWithBool:YES];  
  
// 不过直接用下面的方式封装会更方便  
num = @'a';  
num = @97;  
num = @97.0;  
num = @YES;  
  
// 既然NSNumber能封装BOOL，NSInteger，CGFloat等基础数据格式，那如何判断NSNumber是什么基础类型呢，接着看  
/* 
 + (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); 
 */  
num = [NSNumber numberWithChar:'a'];  
NSLog(@"%@ %@", NSStringFromClass(num.class), @(num.objCType)); // __NSCFNumber c  
num = [NSNumber numberWithUnsignedChar:'a'];  
NSLog(@"%@ %@", NSStringFromClass(num.class), @(num.objCType)); // __NSCFNumber s  
num = [NSNumber numberWithShort:97];  
NSLog(@"%@ %@", NSStringFromClass(num.class), @(num.objCType)); // __NSCFNumber s  
num = [NSNumber numberWithUnsignedShort:97];  
NSLog(@"%@ %@", NSStringFromClass(num.class), @(num.objCType)); // __NSCFNumber i  
num = [NSNumber numberWithInt:97];  
NSLog(@"%@ %@", NSStringFromClass(num.class), @(num.objCType)); // __NSCFNumber i  
num = [NSNumber numberWithUnsignedInt:97];  
NSLog(@"%@ %@", NSStringFromClass(num.class), @(num.objCType)); // __NSCFNumber q  
num = [NSNumber numberWithLong:97];  
NSLog(@"%@ %@", NSStringFromClass(num.class), @(num.objCType)); // __NSCFNumber i  
num = [NSNumber numberWithUnsignedLong:97];  
NSLog(@"%@ %@", NSStringFromClass(num.class), @(num.objCType)); // __NSCFNumber q  
num = [NSNumber numberWithLongLong:97];  
NSLog(@"%@ %@", NSStringFromClass(num.class), @(num.objCType)); // __NSCFNumber q  
num = [NSNumber numberWithUnsignedLongLong:97];  
NSLog(@"%@ %@", NSStringFromClass(num.class), @(num.objCType)); // __NSCFNumber q  
num = [NSNumber numberWithFloat:1.2];  
NSLog(@"%@ %@", NSStringFromClass(num.class), @(num.objCType)); // __NSCFNumber f  
num = [NSNumber numberWithDouble:1.2];  
NSLog(@"%@ %@", NSStringFromClass(num.class), @(num.objCType)); // __NSCFNumber d  
num = [NSNumber numberWithBool:YES];  
NSLog(@"%@ %@", NSStringFromClass(num.class), @(num.objCType)); // __NSCFBoolean c  
num = [NSNumber numberWithInteger:97];  
NSLog(@"%@ %@", NSStringFromClass(num.class), @(num.objCType)); // __NSCFNumber i  
num = [NSNumber numberWithUnsignedInteger:YES];  
NSLog(@"%@ %@", NSStringFromClass(num.class), @(num.objCType)); // __NSCFNumber i  

// num.objCType 代表类型编码@encode(type-name)  
// 这样就看出来了，判断整型int类，包括short, unsigned short, int, unsigned int, long, unsigned long, long long, unsigned long long，就这样判断  
NSArray *intTypeArray = @[@"s", @"i", @"q"];  
NSString *intType = [NSString stringWithFormat:@"%s", num.objCType];  
if ([NSStringFromClass(num.class) isEqualToString:@"__NSCFNumber"] && [intTypeArray containsObject:intType]) {  
    NSLog(@"%@是一个整数", num);  
}  
// 浮点型判断  
NSArray *floatTypeArray = @[@"f", @"d"];  
NSString *floatType = [NSString stringWithFormat:@"%s", num.objCType];  
if ([NSStringFromClass(num.class) isEqualToString:@"__NSCFNumber"] && [floatTypeArray containsObject:floatType]) {  
    NSLog(@"%@是一个浮点型", num);  
}  
// char判断  
NSArray *charTypeArray = @[@"c"];  
NSString *charType = [NSString stringWithFormat:@"%s", num.objCType];  
if ([NSStringFromClass(num.class) isEqualToString:@"__NSCFNumber"] && [charTypeArray containsObject:charType]) {  
    NSLog(@"%@是一个字符型", num);  
}  
// BOOL判断  
if ([NSStringFromClass(num.class) isEqualToString:@"__NSCFBoolean"]) {  
    NSLog(@"%@是一个字符型", num);  
}  
if ([num isKindOfClass:NSClassFromString(@"__NSCFBoolean")]) {  
    NSLog(@"num is BOOL type");  
} else {  
    NSLog(@"num is not BOOL type");  
}  

// 下面聊NSNumberFormatter  
// 从学号谈起，一般学号的全格式是 入学年份（前两位）+大学(学院)代码+专业代码+班级+个人班级学号 05+01+02+1+01，给班级学生列成绩单，知道学生班级学号，生成学校学号，如5号，应该生成050102105，我们想到的方法是c中的格式化，例如：  
NSInteger classCode = 5;  
NSString *schoolStuCode = [NSString stringWithFormat:@"0501021%2.2d", classCode];  
NSLog(@"schoolStuCode = %@", schoolStuCode); // 050102105  
  
// 另一种方法是NSNumberFormatter转换，上代码  
// 数据格式转换类  
NSNumberFormatter *numberFormatter = [[NSNumberFormatter alloc] init];  
  
numberFormatter.numberStyle = kCFNumberFormatterNoStyle;  
numberFormatter.formatWidth = 2;    // 数据宽度为2，不足前面补0  
numberFormatter.paddingCharacter = @"0";  
schoolStuCode = [NSString stringWithFormat:@"0501021%@", [numberFormatter stringFromNumber:@(classCode)]];  
NSLog(@"schoolStuCode = %@", schoolStuCode); // 050102105  
// 这里也输出了050102105  
  
// 之后体验NSNumberFormatter强大功能  
// 字符串分隔，可用于手机号显示  
NSString *formatterStr;  
numberFormatter.numberStyle = kCFNumberFormatterDecimalStyle;  
formatterStr = [numberFormatter stringFromNumber:@102140302];  
NSLog(@"%@", formatterStr); // 102,140,302  
// 从格式字符串转换为数据，其他类似  
NSNumber *number = [numberFormatter numberFromString:formatterStr];  
NSLog(@"number = %@", number);  
// 货币符号  
numberFormatter.numberStyle = NSNumberFormatterCurrencyStyle;  
formatterStr = [numberFormatter stringFromNumber:@1.2];  
NSLog(@"%@", formatterStr); // $1.20  
// 百分数格式  
numberFormatter.numberStyle = kCFNumberFormatterPercentStyle;  
formatterStr = [numberFormatter stringFromNumber:@1.2];  
NSLog(@"%@", formatterStr); // 120%  
// 科学计数格式  
numberFormatter.numberStyle = kCFNumberFormatterScientificStyle;  
formatterStr = [numberFormatter stringFromNumber:@1.2];  
NSLog(@"%@", formatterStr); // 1.2E0  
// 口语格式  
numberFormatter.numberStyle = kCFNumberFormatterSpellOutStyle;  
formatterStr = [numberFormatter stringFromNumber:@1.2];  
NSLog(@"%@", formatterStr); // one point two 

原文转自：http://blog.csdn.net/yanglishuan/article/details/40040771