NSScanner使用方法

96
HenryM
2015.09.16 10:48* 字数 29
  • 实例方法
- (NSString *)string;
- (NSUInteger)scanLocation;
- (void)setScanLocation:(NSUInteger)pos;//<span style="font-family: Arial, Helvetica, sans-serif;">设置开始扫描的位置</span>
- (void)setCharactersToBeSkipped:(NSCharacterSet *)set;//扫描的时候需要忽略的值
- (void)setCaseSensitive:(BOOL)flag; //是否区分大小写
- (void)setLocale:(id)locale; //大概意思是不同语言环境解释字符串的方式不一样,不懂
- (NSCharacterSet *)charactersToBeSkipped; //扫描时所有被忽略的值
- (BOOL)caseSensitive;
- (id)locale;

- (BOOL)scanInt:(int *)value;  //是否找到一个十进制 int
- (BOOL)scanInteger:(NSInteger *)value NS_AVAILABLE(10_5, 2_0);  //是否找到一个十进制 NSInteger
- (BOOL)scanHexLongLong:(unsigned long long *)result NS_AVAILABLE(10_5, 2_0);   //是否找到16进制的long long类型的数字
- (BOOL)scanHexFloat:(float *)result NS_AVAILABLE(10_5, 2_0);       // Corresponding to %a or %A formatting. Requires "0x" or "0X" prefix. 
- (BOOL)scanHexDouble:(double *)result NS_AVAILABLE(10_5, 2_0);     // Corresponding to %a or %A formatting. Requires "0x" or "0X" prefix. 
- (BOOL)scanHexInt:(unsigned *)value;       // Optionally prefixed with "0x" or "0X"
- (BOOL)scanLongLong:(long long *)value;
- (BOOL)scanFloat:(float *)value;
- (BOOL)scanDouble:(double *)value;

- (BOOL)scanString:(NSString *)string intoString:(NSString **)value; <span style="font-family: Arial, Helvetica, sans-serif;">//</span><span style="font-family: Arial, Helvetica, sans-serif;">从scan中扫描出set中的数据放入value中</span>

- (BOOL)scanCharactersFromSet:(NSCharacterSet *)set intoString:(NSString **)value;<span style="font-family: Arial, Helvetica, sans-serif;">//</span><span style="font-family: Arial, Helvetica, sans-serif;">从scan中扫描出set中的数据放入value中</span>
- (BOOL)scanUpToString:(NSString *)string intoString:(NSString **)value;//<span style="font-family: Arial, Helvetica, sans-serif;">从scan中扫描出set之外的数据放入value中</span>
- (BOOL)scanUpToCharactersFromSet:(NSCharacterSet *)set intoString:(NSString **)value;//从scan中扫描出set之外的数据放入value中
- (BOOL)isAtEnd;//是否扫描达到终点

- (id)initWithString:(NSString *)string;
+ (id)scannerWithString:(NSString *)string;
+ (id)localizedScannerWithString:(NSString *)string;

  • 判断是否是int类型
 - (BOOL)isPureInt:(NSString*)string{    
              NSScanner* scanner = [NSScanner scannerWithString:string];    
              int intVal;    
              return [scanner scanInt:&intVal] && [scanner isAtEnd];
}
  • 判断是否是float类型
 - (BOOL)isPureFloat:(NSString*)string{    
              NSScanner* scanner = [NSScanner scannerWithString:string];    
              float floatVal;    
              return [scanner scanFloat:&floatVal] && [scanner isAtEnd];
}
  • 方法使用
NSString * numStr = @"a1b2c3d4e5f6“;
NSScanner * scanner = [NSScanner scannerWithString:numStr];
NSCharacterSet * numSet = [NSCharacterSet decimalDigitCharacterSet];
while (NO == [scanner isAtEnd]) {
  if ([scanner scanUpToCharacterFromSet:numSet intoString:NULL]) {
      int num;
    if ([scanner scanInt:&num]) {
        NSLog(@"num : %d”,num);
      }
}
}
结果是: num : 1
        num : 2
        num : 3
        num : 4
        num : 5
        num : 6
  • 读取下一行
[scanner scanCharactersFromSet:[NSCharacterSet newlineCharacterSet]  intoString:NULL]; 
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