iOS 開發：去除頭尾空白、去除特殊符號

 NSCharacterSet *set = [NSCharacterSet characterSetWithCharactersInString:@"/@／：；（）¥「」/＂、[]{}#%-*+=_\\|~＜＞$€^•’@#$%^&*()_+’\""];

NSString *trimmedString = [city.text stringByTrimmingCharactersInSet:set];

 

 

NSString *str = [textField.text stringByTrimmingCharactersInSet:[NSCharacterSet whitespaceCharacterSet]];

    

 

NSUInteger len = 0;

len = [trimmedString length];