我有以下代码打印更新图像的网址
override func viewWillAppear(animated: Bool) {
NSNotificationCenter.defaultCenter().addObserver(self, selector: "assetChange:", name: ALAssetsLibraryChangedNotification, object: nil) }
func assetChange(notification: NSNotification){
if var info:NSDictionary = notification.userInfo { var url:NSSet = info.objectForKey(ALAssetLibraryUpdatedAssetsKey) as NSSet
var aurl:NSURL = url.anyObject() as NSURL
println(aurl)
}
}
这段代码工作正常,但它只打印第一个修改过的图片网址,但是我想要修改后的图片网址列表(修改过的图像数组)请帮帮我
答案 0 :(得分:1)
使用url.anyObject()
时,您正在从集合中选择一个对象。相反,您需要从集合中获取所有对象,然后遍历数组。以下代码可以帮助您:
func assetChange(notification: NSNotification) {
if var info:NSDictionary = notification.userInfo { var url:NSSet = info.objectForKey(ALAssetLibraryUpdatedAssetsKey) as NSSet
var urls: [NSURL] = url.allObjects as [NSURL]
for singleUrl in urls {
println(singleUrl)
}
}
}