输入框UITextField禁止输入空格

1，遵循UITextField的代理方法 2，实现代理方法

- (BOOL)textField:(UITextField *)textField shouldChangeCharactersInRange:(NSRange)range replacementString:(NSString *)string { NSString *tem = [[string componentsSeparatedByCharactersInSet:[NSCharacterSet whitespaceCharacterSet]]componentsJoinedByString:@""]; if (![string isEqualToString:tem]) { return NO; } return YES; }