代码：
cell.textLabel?.lineBreakMode = UILineBreakModeWordWrap
出错：
Use of unresolved identifier ‘UILineBreakModeWordWrap’
搜：
UILineBreakModeWordWrap
参考：
改为：
cell.textLabel?.lineBreakMode = UILineBreakMode.WordWrap
出错：
‘UILineBreakMode’ is unavailable: APIs deprecated as of iOS 7 and earlier are unavailable in Swift
cell.textLabel?.lineBreakMode = NSLineBreakMode.ByWordWrapping
即可。
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