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stackView依次有4个arrangedSubview:view1red,view2yellow,view3green,view4orange
在系统方法中再次调用[stackView addArrangedSubview:view2yellow];view2yellow会被移动到最后面,view顺序变成view1red,view3green,view4orange,view2yellow
但是在iOS8 FDStackView中view2yellow的位置不会变动。