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假设这两个子视图的tag分别为1000,和1001，则代码如下：

NSInteger index1 = [[parentView subviews] indexOfObject:[parentView viewWithTag:1000]];
NSInteger index2 = [[parentView subviews] indexOfObject:[parentView viewWithTag:1001]];
[parentView exchangeSubviewAtIndex:index1 withSubviewAtIndex:index2];