Fixing OS X Install Errors “can’t be verified” and “error occurred while preparing the installation”Two unusual error messages that can occur during the attempted installation of OS X El Capitan or OS X Yosemite are the “This copy of the Install OS X El Capitan application can’t be verified. It may have been corrupted or tampered with during downloading” error, or a “This copy of the Install OS X Yosemite application can’t be verified. It may have been corrupted or tampered with during downloading” message, or a more vague “An error occurred while preparing the installation. Try running again” error message. It’s possible to encounter these errors during basically any type of installation attempt in OS X El Capitan or OS X Yosemite, ranging from the standard App Store update, using Internet Recovery, to clean installs, and using a bootable installer volume on a target Mac. If you run into either error message while trying to update or install OS X while from an active OS X boot (say, a standard upgrade from the App Store), you can typically resolve the problem simply by setting the Date & Time on the Mac to be determined automatically. To do this, go to the . If you’re on a computer without internet access, or if you encounter the problem during an alternative OS X installation method and thus can’t access System Preferences, turning to the Terminal to set the date is the next option. To determine if the Terminal date trick can fix those error messages and help you to successfully install OS X, you’ll need to turn to the command line while at the “Install OS X” boot menu. Pull down the “Utilities” menu option and choose “Terminal”, then type the following command into the prompt: date. Hit return, and if the reported date is anything other than the actual current date, then you’ve almost certainly found the cause of the problem. This may look something like: Mon Jan 1. PST 1. 98. 4The entire line matters, as the date must be correct in order to install OS X, specifically the year, because if the date set is prior to the release of OS X, the error will trigger. Pay special attention to the year as an obvious indicator of something wrong. If you notice the date is completely wrong, you can set it the current date and time using a variation of the same terminal command. Setting it via the internet is easier: ntpdate - u time. That will not work if the Mac does not have internet access, however. Thus, you’d need to use the . The manual date format to use is a little weird, if you’re familiar with the command line you can retrieve it yourself by using date –help, which looks something like “. For example, to set the date as “September 2.
How To Fix iTunes Error 3194 When Downgrading iPhone. An unknown error occurred. If you're downloading over 3G or LTE, the limit has been raised to 100MB. It may look like a random string of numbers but it’s actually the month 0. Once you enter the proper date and hit return, you can exit out of Terminal and begin the installation process again as originally intended, and OS X should no longer throw the dodgy sounding error messages. Do note that sometimes you will see the “This copy of the Install OS X Yosemite application can’t be verified. It may have been corrupted or tampered with during downloading” error message because the actual installer was modified or damaged during a download, to be sure that is not the case, always download the OS X installer applications directly from Apple and the App Store, and never from a third party site. Also, sometimes the “An error occurred while preparing the installation. Try running again” error message will appear and resolve itself with a simple reboot. Nonetheless these two error messages also display when the system date on the Mac is set incorrectly, which is obviously what we’re discussing here. This troubleshooting trick was left in our comments by DAVIDSDIEGO who found the solution on bensmann. It’s notable that both users encountered different error messages despite having the same resolution. Let us know in the comments if this helped to resolve these specific error messages for you, and if not, what method did work to fix the install error with OS X. ![]() If you haven’t read that yet, check out
So, we now have the functionality we’re looking for, but if you run this yourself you’ll see its super slow! The issue is that the images in these cells are downloading on the UI thread, one at a time, and they aren’t being cached at all. So let’s fix that. Let’s start by adding a lookup dictionary as a member for our Search. Results. View. Controller class:
So for example, if I have an image named “Bob” set to the UIImage with the file name “Bobs. Picture. jpg”, I might add him to the dictionary like this:
Let’s start by moving the img. Data call out of our optional chain, and instead put it inside of the block that updates the cells. We’ll do this so that we can use image data from our cache *or* perform a new download, depending on the situation. Here, we’re switching to using NSURLConnection’s send. Asynchronous. Request method in order to download the image data on a background thread.
Data: NSDictionary = self. Data? NSDictionary. Grab the artwork. Url. 60 key to get an image URL for the app's thumbnail. String = row. Data? String. img. URL = NSURL(string: url. String). // Get the formatted price string for display in the subtitle. Price = row. Data? String. // Get the track name. Name = row. Data? Let’s run through the changes real quick. This is required if you want the cell to actually include an image view. Otherwise even loading in our image later will not show up! Create a blank image (I’m using 5. You can just
With. Contents. Of. File, but here we’re going to switch to NSURLConnection’s send. Asynchronous. Request, more similar to how our API works. The reason being is that we want to send off lots of small requests for images real quick, and we want to do it in the background. So let’s do that. Look at the line with a call to NSURLConnection’s static method send. Asynchronous. Request, which takes a function/closure as a parameter for completion. Handler. The lines after this call represent a function that is executed only *after* the async request returns.
View, based on the index path. If this comes back nil, then we know the cell is no longer visible and can skip the update. Okay! Give the project a run and see our amazing new blazingly fast, silky smooth table view! The complete code up to this point is available on
Let’s speed it up. So, we now have the functionality we’re looking for, but if you run this yourself you’ll see its super slow! The issue is that the images in these cells are downloading on the UI thread, one at a time, and they aren’t being cached at all. So let’s fix that. Let’s start by adding a lookup dictionary as a member for our Search. Results. View. Controller class:
So for example, if I have an image named “Bob” set to the UIImage with the file name “Bobs. Picture. jpg”, I might add him to the dictionary like this:
Cache. So if I wanted to get that image of Bob back out, I could just use:
Let’s start by moving the img. Data call out of our optional chain, and instead put it inside of the block that updates the cells. We’ll do this so that we can use image data from our cache *or* perform a new download, depending on the situation. Here, we’re switching to using NSURLConnection’s send. Asynchronous. Request method in order to download the image data on a background thread.
UITable. View. Cell.
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