Called after the object has been loaded from the nib file. Overriders must call base. Invokes the selector on the current instance and if the obj is not null, it passes this as its single parameter. Stops the specified observer from receiving further notifications of changed values for the specified keyPath. Stops the specified observer from receiving further notifications of changed values for the specified keyPath and context.
Indicates an attempt to write a value to an undefined key. Indicates an attempt to read a value of an undefined key. Feedback will be sent to Microsoft: By pressing the submit button, your feedback will be used to improve Microsoft products and services.
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NSError IntPtr. A constructor that initializes the object from the data stored in the unarchiver object. Constructor to call on derived classes to skip initialization and merely allocate the object. A constructor that initializes the object with a specified domain and an error code. Inherited from NSObject. A developer-meaningful description of this object. To achieve a similar effect, the best way is to throw exceptions in superclass methods that must be overridden by subclasses. In this case, as long as someone directly creates an instance of the abstract base class and uses it, an exception will be thrown:.
Since exceptions are only used to handle fatal errors fatal errors , what about other errors? In this case, if the if statement finds that the current instance cannot be initialized with the parameter value passed in for example, this method requires that the value parameter passed in must be non-nil , then set self to nil.
In this case, The return value of the entire method is also nil. The caller found that the initialization method did not create the instance, so it can be determined that an error occurred.
Three pieces of information are encapsulated in the NSError object:. The range where the error occurred. That is, the source of the error is usually defined by a unique global variable. Unique error code, used to indicate what kind of error occurred within a certain range.
A series of related errors may occur within a certain range, and these error conditions are usually defined by enum. Additional information about this error, which may include a "localized description", or another error that caused the error.
Through this information, related errors can be chained into an "error chain" Chain of errors. When an error occurs, the current object will pass the error information to the delegate through a method in the protocol. After an NSURLConnection error occurs for example, the connection to the remote server has timed out , this method will be called to handle the related error.
This delegate method does not necessarily have to be implemented: it is up to the user of the NSURLConnection class to determine whether this error must be handled. This is better than throwing an exception, because the caller can at least decide for themselves whether NSURLConnection reports this error. When set to false , the new value does not apply until the next run of the app. Crash Insights helps you resolve issues by comparing your anonymized stack traces to traces from other Firebase apps and letting you know if your issue is part of a larger trend.
For many issues, Crash Insights even provides resources to help you debug the crash. Crash Insights uses aggregated crash data to identify common stability trends. Except as otherwise noted, the content of this page is licensed under the Creative Commons Attribution 4. For details, see the Google Developers Site Policies. Products Build. Firebase Documentation.
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Create a free Team What is Teams? Collectives on Stack Overflow. Learn more. Do I need to release a returned NSError object? Ask Question. Asked 12 years ago. Active 9 years, 5 months ago. Viewed 3k times. Improve this question. Add a comment. Active Oldest Votes. Improve this answer.
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