问题 myDic["imgUrl"]!) == "null"
```
ifmyDic["imgUrl"]isNSNull{
}else{
if( (myDic["imgUrl"]asAnyObject).classForCoder ==NSNull.classForCoder() ||String(describing: myDic["imgUrl"]!) =="null"){
}else{
leturl =URL(string:myDic["imgUrl"]as!String)!
devicecell.infoImg!.kf.setImage(with:url ,placeholder:UIImage.init(named:"头像"))
devicecell.infoImg.layer.cornerRadius= devicecell.infoImg.frame.size.width/2
devicecell.infoImg.layer.masksToBounds=true
}
}
```
然而当后台将子段改为 myDic["imgUrl"]!) == "" 的时候上面的代码就完了
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