Commit 97952bf
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修复 bug:在冒泡页面反复点击搜索和取消时引起 crash,因为 search display view controller 的 content view 是直接添加到父vc 的 view 上,在非 active 时 content view 被移除,而请求热门冒泡有网络延迟,可能返回结果时 content view 已被移除,但是因为在 completion block 里需要根据 content view 调整 topic hot key view, 所以引起 crash;
更好的办法是搜索页面非 active 时 cancel 请求,但是改动较大;1 parent faab78a commit 97952bf
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