NSString *s = [str stringByTrimmingCharactersInSet:[NSCharacterSet whitespaceAndNewlineCharacterSet]];//該方法是去掉兩端的空格

或者可以用 NSString *s =? [s stringByTrimmingCharactersInSet:[NSCharacterSet characterSetWithCharactersInString:@" "]];

NSLog(@"hl%@ehe",s);? 輸出結(jié)果為：hl#####! 2 Z c cehe

—去掉指定符號：

NSString *b = [s stringByTrimmingCharactersInSet:[NSCharacterSet characterSetWithCharactersInString:@"#!"]];//該方法是去掉指定符號

NSLog(@"hl%@",b);輸出結(jié)果為：hl 2 Z c c

—去掉字符串中所有的空格符

NSString *string =? @"? ? Just? ? play? a? ? test? ? .? ";

NSCharacterSet *whitespaces = [NSCharacterSet whitespaceCharacterSet];

NSPredicate *noEmptyStrings = [NSPredicate predicateWithFormat:@"SELF != ''"];

NSArray *parts = [string componentsSeparatedByCharactersInSet:whitespaces];//在空格處將字符串分割成一個 NSArray

NSArray *filteredArray = [parts filteredArrayUsingPredicate:noEmptyStrings];//去除空串

NSString *jointStr? = @"" ;

string = [filteredArray componentsJoinedByString:jointStr];

NSLog(@"開始%@結(jié)束",string);//輸出結(jié)果為：開始Justplayatest.結(jié)束

如果NSString *jointStr? = @" " ;

那么NSLog(@"開始%@結(jié)束",string);//輸出結(jié)果為：開始Just play a test .結(jié)束