iOS8系统下部分情况下卡顿问题
Nobody has claimed this yet.
Assessment
- Difficulty
- 4/5
- Estimated time
- 3-5 days
- Newbie friendliness
- 45/100
- Issue type
- Bug
- Clarity
- Mostly clear
- Activity status
- Stale
- Tech stack
- objective-c
- Domain
- mobile-dev, performance
Research direction
Locate intrinsicContentSizeInvalidatedForChildView: and trace its calls into distributionArrangement and alignmentArrangement. Reproduce the scrolling slowdown with a UITableViewCell containing multiple text views on iOS 8, then verify that child-size invalidation does not trigger unnecessary repeated stack-view layout while preserving the existing arrangement behavior.
Written by the indexing model from the issue text.
Description
(void)intrinsicContentSizeInvalidatedForChildView:(UIView *)childView {
[self.distributionArrangement intrinsicContentSizeInvalidatedForItem:childView];
[self.alignmentArrangement intrinsicContentSizeInvalidatedForItem:childView];
}
方法名很明确指出需要无效化传进去的childView的intrinsicSize，但是方法全程内部并没有用到childView而是对整个stackView重新布局了，以至于只要stackView有一些小改动，整个stackView都要跟着刷新，如果stackView里有两个childView需要更新，根据代码逻辑，刷新就会调用两次，这性能损耗非常大，目前我已应用在UITableViewCell的布局中，Cell上如果需要设置多个文本时滚动卡顿非常明显（iOS8下）
- Dominant language
- Objective-C
- Stars
- 2.5k
- Forks
- 310
- PR merge metrics
- No merged PRs in 30d
Contributor guide
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