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我正在为我的某个应用程序在用户配置文件屏幕上工作。我想让用户从他的手机中选择一个图像,并能够在应用程序的主屏幕中看到他的个人资料图像。我遇到的问题是,图像比纯文本保存时间更长。我想找到一种方法来确保在segue将用户带到主屏幕之前将图像保存为解析。现在,只要我点击下一步,segue就会将用户带到主屏幕。在主屏幕中,用户的配置文件图像无法显示,因为被“保存”为解析的配置文件图像为空。当发生这种情况时,我得到一个零值异常。将图像保存为解析
注意:当我删除塞格 - 应用程序成功保存用户的信息和用户的图像。
以下代码后,我做我的所有支票上的用户名,密码等
if photoSelected == false {
error = "Please select an image to post"
}
if error != "" {
displayAlert("Cannot Post Image", error: error)
} else {
var post = PFObject(className: "Images")
post["username"] = PFUser.currentUser().username
post.saveInBackgroundWithBlock({ (success: Bool, error: NSError!) -> Void in
if success == false {
self.displayAlert("Could not post Image", error: "Please try again later")
} else {
let imageData = UIImagePNGRepresentation(self.profileImage.image)
let profilePic = PFFile(name: "image.png", data: imageData)
post["profileImage"] = profilePic;
//I even added an activity indicator to stall the app before proceeding to the main page.
activityIndicator = UIActivityIndicatorView(frame: CGRectMake(0, 0, 200, 200))
activityIndicator.center = self.view.center
activityIndicator.hidesWhenStopped = true
activityIndicator.activityIndicatorViewStyle = UIActivityIndicatorViewStyle.WhiteLarge
self.view.addSubview(activityIndicator)
activityIndicator.startAnimating()
UIApplication.sharedApplication().beginIgnoringInteractionEvents()
post.saveInBackgroundWithBlock({ (success: Bool, error: NSError!) -> Void in
UIApplication.sharedApplication().endIgnoringInteractionEvents()
if success == false {
self.displayAlert("Could not post Image", error: "Please try again later")
} else {
//check
println("picture was uploaded")
}
})
}
})
}
//saves all the user's values username, password, etc.
self.user.save()
//takes the user to the MainScreen
self.performSegueWithIdentifier("moveToMainScreen", sender: self)
}
非常感谢你的帮助! 。
谢谢你 - 这真是棒极了应用程序不会崩溃了。 ) – Ronaldoh1 2015-02-09 01:38:05