將 weak 拿掉(變成strong ) 就行了@@
很感謝:https://stackoverflow.com/questions/27494542/when-can-i-activate-deactivate-layout-constraints
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將 weak 拿掉(變成strong ) 就行了@@
很感謝:https://stackoverflow.com/questions/27494542/when-can-i-activate-deactivate-layout-constraints
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