//方法一
NSMutableString *mst = [[NSMutableString alloc] init];;
NSString *str = @"hqrtyuiolmnbv";
[mst setString:str];
for (int i = 0; i < str.length*2; i++) {
if (i%2 == 0) { // 根据奇偶判断是否插入
[mst insertString:@" " atIndex:i]; //插入空格
}
}
//方法二
- (NSString *)addSpaceFromSring:(NSString *)str {
int count = 0;
long long int a = str.longLongValue;
while (a != 0) {
count++;
a /= 10;
}
NSMutableString *muString = [NSMutableString stringWithString:str];
NSMutableString *newString = [NSMutableString string];
while (count > 1) {
count -= 1;
NSRange rang = NSMakeRange(muString.length - 2, 2);
NSString *cunStr = [muString substringWithRange:rang];
[newString insertString:cunStr atIndex:0];
[newString insertString:@" " atIndex:0];
[muString deleteCharactersInRange:rang];
}
[newString insertString:muString atIndex:0];
return newString;
}
