NSArray *ArrayStr =[NSArray arrayWithObjects:@"1",@"2",@"3",@"4",@"5",@"6",@"7",@"8",@"9",@".",@"0",@"x", nil];
for(int i=0; i<ArrayStr.count; i++)
{
    NSInteger index = i%3;
    NSInteger page = i/3;
    
    UIButton * btn =[UIButton buttonWithType:UIButtonTypeCustom];
    CGFloat w = self.view.frame.size.width/3;
    btn.frame = CGRectMake(index * (self.view.frame.size.width/3), page  * 100,w,100);
    btn.tag=i;
    NSString *title = [ArrayStr objectAtIndex:i];
    [btn setTitle:title forState:normal];
    btn.titleLabel.font = [UIFont systemFontOfSize:29 weight:UIFontWeightRegular];
    [btn setTitleColor:[UIColor blackColor] forState:normal];
    if ([title isEqualToString:@" "] || [title isEqualToString:@"x"]) {
        if ([title isEqualToString:@"x"]) {
            [btn setTitle:@"" forState:UIControlStateNormal];
            [btn setImage:[UIImage imageNamed:@"keyboard_delete"] forState:UIControlStateNormal];
        }
        btn.backgroundColor = [UIColor colorWithHexString:@"#FCFCFC"];
    }else{
        btn.backgroundColor = [UIColor colorWithHexString:@"#FCFCFC"];
    }
    [btn addTarget:self action:@selector(didClickKeyBorad:) forControlEvents:UIControlEventTouchUpInside];
    [bottomView addSubview:btn];
}