//  3.实现函数NSString * stringWithoutNum(NSString *str);
//    删除字符串str的所有数字

1. #import <Foundation/Foundation.h>
   
2. NSString * stringWithoutNum(NSString *str);
   
3. int main(int argc, const char * argv[])
   
4. {
   
5.     NSString *s = @"ddfsfds1fdfdsf12dsf12ds1f2ds1f2d1";
   
6.     NSString *s2 = stringWithoutNum(s);
   
7.     NSLog(@"%@",s2);
   
8.     return 0;
   
9. }
   
10. NSString * stringWithoutNum(NSString *str)
    
11. {
    
12.     NSMutableString *s = [[NSMutableString alloc] initWithFormat:@"%@",str];
    
13.     NSLog(@"%@",s);
    
14.     for (int i = 0; i<s.length; i++) {
    
15.         char temp = [s characterAtIndex:i];
    
16.         if(temp<='9'&&temp>='0')
    
17.         {
    
18.             [s deleteCharactersInRange:NSMakeRange(i, 1)];
    
19.         }
    
20.     }
    
21.     return s;
    
22. }

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为什么当连续有两个数字时就删除不了了

//  3.实现函数NSString * stringWithoutNum(NSString *str);
//    删除字符串str的所有数字

1. #import <Foundation/Foundation.h>
   
2. NSString * stringWithoutNum(NSString *str);
   
3. int main(int argc, const char * argv[])
   
4. {
   
5.     NSString *s = @"ddfsfds1fdfdsf12dsf12ds1f2ds1f2d1";
   
6.     NSString *s2 = stringWithoutNum(s);
   
7.     NSLog(@"%@",s2);
   
8.     return 0;
   
9. }
   
10. NSString * stringWithoutNum(NSString *str)
    
11. {
    
12.     NSMutableString *s = [[NSMutableString alloc] initWithFormat:@"%@",str];
    
13.     NSLog(@"%@",s);
    
14.     for (int i = 0; i<s.length; i++) {
    
15.         char temp = [s characterAtIndex:i];
    
16.         if(temp<='9'&&temp>='0')
    
17.         {
    
18.             [s deleteCharactersInRange:NSMakeRange(i, 1)];
    
19.         }
    
20.     }
    
21.     return s;
    
22. }

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为什么当连续有两个数字时就删除不了了