swift is only available on iOS 9.0 or newer 报错
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is only available on iOS 9.0 or newer
出现此报错的原因是你使用了只适用于新版本的API，解决方法十分简单，先检查平台
if #available(iOS 9.0, *) {
//把出现报错的特性在这里处理
} else {
//ios9以下的如需处理在这里用低版本API处理
}
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