Objective-C基础学习之字符串替换

1.字符串的替换函数

• -(NSString )stringByReplacingOccurrencesOfString:(NSString )target withString:(NSString *)replacement;

  • 用replacement替换target

    NSString *str = @"http:&&www.xiaoningle.com&img&logo.png";
    NSString *newStr = [str stringByReplacingOccurrencesOfString:@"&" withString:@"/"];
    NSLog(@"newStr = %@", newStr);

输出结果: http://www.xiaoningle.com/img/logo.png

• -(NSString )stringByTrimmingCharactersInSet:(NSCharacterSet )set;
  • 去除首尾

    NSString *str =  @"    http://www.xiaoningle.com/img/logo.png   ";
    NSString *newStr = [str stringByTrimmingCharactersInSet:[NSCharacterSet whitespaceCharacterSet]];
    NSLog(@"str =|%@|", str);
    NSLog(@"newStr =|%@|", newStr);

输出结果:
str =|    http://www.xiaoningle.com/img/logo.png   |
newStr =|http://www.xiaoningle.com/img/logo.png|

    NSString *str =  @"***http://www.xiaoningle.com/img/logo.png***";
    NSString *newStr = [str stringByTrimmingCharactersInSet:[NSCharacterSet characterSetWithCharactersInString:@"*"]];

    NSLog(@"str =|%@|", str);
    NSLog(@"newStr =|%@|", newStr);

输出结果:
str =|***http://www.xiaoningle.com/img/logo.png***|
newStr =|http://www.xiaoningle.com/img/logo.png|