I've changed my app class type from 开发者_如何学运维NSObject to NSApplication and now I get the following message when testing my app:
Could not connect the action buttonClicked: to target of class NSApplication
What does this mean and how can I fix it?
NSApplication does not respond to the buttonClicked: method and, therefore, there is no way for the target/action connection to be successfully made.
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是否在对方手机上显示已读，是由用户自行设置的。依次打开iPhone的“设置-信息”，会有一个“发送已读回执”的选项。将其打开，对方就能看到你，是否已经阅读了本条iMessage信息。将其关闭，对方就看不到。
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