NSString 遍历字符串的每一个字符并替换相关的字符

主要方法：获取子字符串：

substringWithRange:

替换字符串：

stringByReplacingCharactersInRange:range

NSString *string = @"this is my name";

for (int i = 0; i<[string length]; i++) {

//截取字符串中的每一个字符

NSString *s = [string substringWithRange:NSMakeRange(i, 1)];

NSLog(@"string is %@",s);

if ([s isEqualToString:@"m"]) {

NSRange range = NSMakeRange(i, 1);

//将字符串中的“m”转化为“w”

string = [string stringByReplacingCharactersInRange:range withString:@"w"];

}

}

NSLog(@"%@",string);