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我试图追加从解析数据库中检索到的图像,但没有任何内容被添加到UIImage数组中。如何追加检索到的图像?为什么图像没有被添加到数组中?
var arrayOfFriends: [UIImage] = []
func getFriendPic(){
var imagequery = PFQuery(className: "_User")
imagequery.findObjectsInBackgroundWithBlock {(objects: [AnyObject]?, error: NSError?) -> Void in
for object in objects!{
let userPic = object["ProPic"] as! PFFile
userPic.getDataInBackgroundWithBlock({ (imageData: NSData?, error: NSError?) -> Void in
if(error == nil){
let image = UIImage(data: imageData!)
//breakpoint placed on line below, but app crashes with array out of bounds.
self.arrayOfFriends.append(image!)
print(self.arrayOfFriends)
}
dispatch_async(dispatch_get_main_queue()) {
self.collectionView.reloadData()
}
})
}
}
}
你是否已经开始使用调试器来查看代码中发生了什么? – Paulw11
是的,该数组有0值 – xxtmanxx
是的,但你的'imageQuery'返回任何对象? 'getDataInBackgroundWithBlock'是否返回任何数据? – Paulw11