Error Handling In Iphone Sdk
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Learn more about hiring developers or posting ads with us Stack Overflow Questions Jobs Documentation c++ error handling Tags Users Badges Ask Question x Dismiss Join the Stack Overflow Community Stack Overflow is a community of 4.7 million programmers, just like ruby error handling you, helping each other. Join them; it only takes a minute: Sign up Error Handling in Xcode, iPhone SDK up vote 2 down vote favorite 2 In Visual Basic, there's a line of code you can use
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to handle errors in code "On Error Resume Next" Is there something similar in Objective-C? My problem is I have an "Add New Cell" add button that creates a new cell during runtime. However, the cells are re-orderable. When you try to re-order the "Add New Cell" cell, I get an index out of bounds error. If I can just fix the error from occurring that would be great, but if there's an error handler
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I can use to just exit the move function when there is an error, that would be cool too. Here is my moveRowAtIndexPath code: - (void)tableView:(UITableView *)tableView moveRowAtIndexPath:(NSIndexPath *)fromIndexPath toIndexPath:(NSIndexPath *)toIndexPath { iProfileAppDelegate *appDelegate = [[UIApplication sharedApplication] delegate]; [appDelegate moveFromOriginal:fromIndexPath.row toNew:toIndexPath.row]; } Here is the error i receive: *** Terminating app due to uncaught exception 'NSRangeException', reason: '*** -[NSCFArray objectAtIndex:]: index (7) beyond bounds (7)' iphone xcode uitableview error-handling share|improve this question edited Nov 29 '11 at 16:16 asked Nov 10 '09 at 6:55 WrightsCS 41.2k19110156 add a comment| 3 Answers 3 active oldest votes up vote 3 down vote accepted You can use try and catch. They are how objective c, and some others, handle exceptions. They will catch the "uncaught exception" similar to how I assume would "On Error Resume Next" works. @try { /*this is where the code that might throw an exception goes*/ [appDelegate moveFromOriginal:fromIndexPath.row toNew:toIndexPath.row]; } @catch (NSException *exception) { /*add something here if you want it to do something special when the exception(or "error") is thrown*/ } @finally { /*you don't have to include this finally part but if you do the code in it is excecuted weather the exception is thrown or not*/ } share|improve this answer answered Nov 10 '09 at 7:17 Jamvert 665 This worked perfect. Is there anyway to get the "Ad
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about Stack Overflow the company Business Learn more about hiring developers or posting ads with us Stack Overflow facebook error codes Questions Jobs Documentation Tags Users Badges Ask Question x Dismiss Join the Stack Overflow Community Stack Overflow is a community of 4.7 million programmers, just like you, helping each http://stackoverflow.com/questions/1706069/error-handling-in-xcode-iphone-sdk other. Join them; it only takes a minute: Sign up exception handling in iphone? up vote 4 down vote favorite what is the syntax for handle the exceptions in iphone sdk? how to handle the exceptions in iphone. what documentation to know more about? tutorial, sample code are most wanted and thankful. iphone objective-c exception exception-handling share|improve this http://stackoverflow.com/questions/2723495/exception-handling-in-iphone question edited Nov 9 '11 at 12:27 User97693321 2,60163665 asked Apr 27 '10 at 17:31 Praveen 45.1k66155209 Possible Duplicate Question :stackoverflow.com/a/12068967/846372 –Soniya Aug 22 '12 at 8:17 add a comment| 2 Answers 2 active oldest votes up vote 6 down vote accepted Exceptions in Objective-C are quite a contentious issue, even Apple themselves discourage you from using them unless absolutely necessary. My first question would be what do you want to achieve from the exception handling? If you're looking from a Java perspective and how exceptions are so tightly integrated in that language for handling errors (i.e. flow control) then I think it's unadvisable to use objective-c exceptions for this purpose, you need to use NSError and handle errors that way. This is a snippet from Apples documentation: - Exceptions are resource-intensive in Objective-C. You should not use exceptions for general flow-control, or simply to signify errors. Instead you should use the return value of a method or function to indicate that an error has occurred, and provide information abo
to Objective-C programs are effective ways of dealing with exceptional conditions. They decouple the detection and handling of these conditions and automate the propagation https://developer.apple.com/library/content/documentation/Cocoa/Conceptual/Exceptions/Tasks/HandlingExceptions.html of the exception from the point of detection to the point https://developer.apple.com/library/content/documentation/Swift/Conceptual/Swift_Programming_Language/ErrorHandling.html of handling. As a result, your code can be much cleaner, easier to write correctly, and easier to maintain.Handling Exceptions Using Compiler DirectivesCompiler support for exceptions is based on four compiler directives:@try —Defines a block of code that is an exception handling domain: code error handling that can potentially throw an exception. @catch() —Defines a block containing code for handling the exception thrown in the @try block. The parameter of @catch is the exception object thrown locally; this is usually an NSException object, but can be other types of objects, such as NSString objects.@finally — Defines a block error code 4 of related code that is subsequently executed whether an exception is thrown or not.@throw — Throws an exception; this directive is almost identical in behavior to the raise method of NSException. You usually throw NSException objects, but are not limited to them. For more information about @throw, see Throwing Exceptions.Important:Although you can throw and catch objects other than NSException objects, the Cocoa frameworks themselves might only catch NSException objects for some conditions. So if you throw other types of objects, the Cocoa handlers for that exception might not run, with undefined results. (Conversely, non-NSException objects that you throw could be caught by some Cocoa handlers.) For these reasons, it is recommended that you throw NSException objects only, while being prepared to catch exception objects of all types.The @try, @catch, and @finally directives constitute a control structure. The section of code between the braces in @try is the exception handling domain; the code in a @catch block is a local e
Classes and Structures Properties Methods Subscripts Inheritance Initialization Deinitialization Automatic Reference Counting Optional Chaining Error Handling Type Casting Nested Types Extensions Protocols Generics Access Control Advanced Operators Language Reference About the Language Reference Lexical Structure Types Expressions Statements Declarations Attributes Patterns Generic Parameters and Arguments Summary of the Grammar Revision History Document Revision History On This Page Representing and Throwing Errors Handling Errors Specifying Cleanup Actions Error Handling Error handling is the process of responding to and recovering from error conditions in your program. Swift provides first-class support for throwing, catching, propagating, and manipulating recoverable errors at runtime. Some operations aren’t guaranteed to always complete execution or produce a useful output. Optionals are used to represent the absence of a value, but when an operation fails, it’s often useful to understand what caused the failure, so that your code can respond accordingly. As an example, consider the task of reading and processing data from a file on disk. There are a number of ways this task can fail, including the file not existing at the specified path, the file not having read permissions, or the file not being encoded in a compatible format. Distinguishing among these different situations allows a program to resolve some errors and to communicate to the user any errors it can’t resolve. Note Error handling in Swift interoperates with error handling patterns that use the NSError class in Cocoa and Objective-C. For more information about this class, see Error Handling in Using Swift with Cocoa and Objective-C (Swift 3). Representing and Throwing Errors In Swift, errors are represented by values of types that conform to the Error protocol. This empty protocol indicates that a type can be used for error handling. Swift enumerations are particularly well suited to modeling a group of related error conditions, with associated values allowing for additi