The program execution will stop only when the specified condition is satisfied, for example, on selecting the Mobilization conference: Run the application in debug mode ⇧ F9 and select random conferences from the list. For this purpose, we can create a special condition: right-click the breakpoint and in the Condition field type end = start: We want the new breakpoint to stop the program execution only when the end and start dates of the conference are the same. Set a new breakpoint at line 21 ( ⌃ F8) and remove the previous one at line 17 by clicking its icon in the gutter. For convenience, we will display the conference data on the Watches tab. Let's add a conditional breakpoint that will stop the program execution only when calling textDates() for one-day conferences. This happens because the textDates() method doesn’t handle the conferences with the same start and end dates correctly. Set a breakpoint right before the decode() method is called, namely, at the following line:
#SWIFT APPCODE TABLEVIEWS CODE#
Let's try to use the formatted decoding strategy instead by injecting new code at runtime. It will bring you to the dateDecodingStrategy property declaration in the Foundation.swift file. For example, choose dateDecodingStrategy and press F4. You can select a necessary symbol on the Variables tab and press F4 (or select Jump to Source from the context menu) to navigate to its source code. We see that our JSONDecoder uses the deferredToDate decoding strategy that can handle dates in double format only, whereas we have string date values in our JSON. If the value is truncated, click View to open it in a popup: You can see all the properties of the JSONDecoder object when expanding this variable. The error that we’ve got ( Expected to decode Double but found a string/data instead) most likely relates to the JSONDecoder object stored in the decoder variable. The Threads & Variables tab displays a stack of method/function calls on the left and a list of variables available in the current context on the right. The program execution will stop at the line that throws the error, and the Debug tool window will appear: For example, you can add breakpoints that hit only when encountering an unhandled Swift error ( Swift) or an Objective-C exception ( Objective-C).Ĭlick Done to apply the changes and start a debugging session by pressing ⇧ F9 or clicking on the toolbar. You can add several exception breakpoint with different settings. This will enable a default exception breakpoint which hits if any exception is thrown: In the Breakpoints dialog that opens, select the Exception Breakpoints checkbox on the left. Let's set an exception breakpoint to locate the code that throws this error: Set an exception breakpointįrom the main menu, select Run | View Breakpoints or press ⌃ ⇧ F8. UnderlyingError: nil)): file /path/to/the/project/ac_tutorial_debugging/iOSConferences/Model/Data.swift, line 27 TypeMismatch(Swift.Double, (codingPath:, debugDescription: "Expected to decode Double but found a string/data instead.", This is really simple as it is a delegate method of the table view.Fatal error: Cannot parse conferencesData.json: Array: We now have all the base code written, so let's start off by adding a leading swipe action. Int Step 3: Adding swipe actions to the table view cells Leading swipe action Add the following code to the ViewController: var data = Array(0. Now you might be thinking that the tableview is completely setup because of the video, however, we still need to add set the delegate and datasources of the tableview.įirst things first, let's create a new variables at the top of the ViewController class that will contain the data that we will show in the table view. One more note before we get started, I am working with a blank new project for this tutorial, so all the work in this tutorial will be done in the standard ViewController class. Also the outlet for my table view is called tableview where the video calls it myTableView. Just note, I have not added a prototype cell to my tableview like this tutorial shows but it shouldn't make a difference. If you don't have one setup you can take a look at this tutorial. destructive and we will talk about the differences between the two.įor this tutorial you will need to setup a tableview.
#SWIFT APPCODE TABLEVIEWS HOW TO#
In this tutorial we will be learning how to do both, we will also be using both actions styles.
When adding swipe actions you can add either leading swipe actions, trailing swipe actions or both kinds of swipe actions.
In this tutorial we will learn how to add those swipe actions to table view cells, as well as go through some of the things to look out for when adding swipe actions. IOS 11 brought a new way to add custom swipe swipe actions to UITableViewCell's.
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