【iOS开发】addSubview 方法

        //TEST
        UIView *baseView = [[UIView alloc]initWithFrame:CGRectMake(0, 0, 100, 100)];
        UIView *addView1 = [[UIView alloc]initWithFrame:CGRectMake(0, 0, 70, 70)];
        UIView *addView2 = [[UIView alloc]initWithFrame:CGRectMake(0, 0, 50, 50)];
        [baseView addSubview:addView1];
        [baseView addSubview:addView2];
        NSLog(@"MARKLEVEL:subviews:%@",baseView.subviews);
        [baseView addSubview:addView2];
        [baseView addSubview:addView1];
        NSLog(@"MARKLEVEL:subviews after:%@",baseView.subviews);

MARKLEVEL:subviews:(
    "<UIView: 0x1014a4a90; frame = (0 0; 70 70); layer = <CALayer: 0x174032e20>>",
    "<UIView: 0x1014a2f00; frame = (0 0; 50 50); layer = <CALayer: 0x174032dc0>>"
)
MARKLEVEL:subviews after:(
    "<UIView: 0x1014a2f00; frame = (0 0; 50 50); layer = <CALayer: 0x174032dc0>>",
    "<UIView: 0x1014a4a90; frame = (0 0; 70 70); layer = <CALayer: 0x174032e20>>"
)