for (NSInteger i=[self.view.subviews count]-1; i>=0; i--) {
[[self.view.subviews objectAtIndex:i] removeFromSuperview];
}
先頭から行うと、取り除くごとにsubviewsの要素が前に詰められて
奇数番目のsubviewしか取り除けないので後ろから取り除く。
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