ios - firstObject vs objectAtIndex:0
来源：互联网 发布：小米网络音响aux 编辑：程序博客网 时间：2024/05/07 23:52
There is one key difference. Using firstObject returns nil if there is none. Using objectAtIndex:0 will crash your app(throws an exception) if there is no object there.From a user experience perspective, crashing is highly advocated against, so it is safer to use firstObject.
BUT the biggest pitfall: firstObject has been available since iOS 4, but was a private API until iOS 7.
http://stackoverflow.com/questions/21923281/ios-firstobject-vs-objectatindex0
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