對於iOS的編碼和解碼

//解決url中文問題   編碼

- (NSString *)encodeURLWithString:(NSString *)unescapedString{

    NSString  *outputStr = (NSString *)CFURLCreateStringByAddingPercentEscapes(kCFAllocatorDefault,(CFStringRef)unescapedString,NULL,(CFStringRef)@"!*'();:@&=+$,/?%#[]",kCFStringEncodingUTF8);

    return outputStr;

}

//解碼

- (NSString *)decodeURLWithString:(NSString *)str{

    NSString *string3 = [str stringByReplacingPercentEscapesUsingEncoding:NSUTF8StringEncoding];

    return string3;

}

//去掉輸入框兩端的空格

- (NSString *)deleteWhitespaceWithStr:(NSString *)str{

    return [str stringByTrimmingCharactersInSet:[NSCharacterSet whitespaceAndNewlineCharacterSet]];

}

//去掉輸入框中間空格

- (NSString *)removeSpace:(NSString *)str{

    return [str stringByReplacingOccurrencesOfString:@" " withString:@""];

}

比較實用的方法