iOS textfield 禁止输入空格

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实现代理方法

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