[btn setImage:[UIImage imageNamed:self.imgAry[i]] forState:UIControlStateNormal];
[btn setImage:[UIImage imageNamed:self.imgDAry[i]] forState:UIControlStateSelected];
[btn addTarget:self action:@selector(btnClick:) forControlEvents:UIControlEventTouchUpInside];
- (void)btnClick:(UIButton *)sender
{
sender.selected = !sender.selected;
}
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