Swift CGD遇到Cannot convert the expression's type 的问题
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dispatch_async(dispatch_get_main_queue(), {
self.refreshControl?.endRefreshing()
})
报错：Cannot convert the expression's type '(dispatch_queue_t!, () -> () -> $T3)' to type 'Void'
dispatch_async(dispatch_get_main_queue(), {
self.refreshControl!.endRefreshing()
})
问好'?'改为感叹号'!，后正常编译运行
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