Xcode. The first line of defense is static code analyzers. The static analyzer built into Xcode is based on the open-source solution for analyzing the source code Clang Static Analyzer, which can search for bugs in C and Objective-C programs. The static analyzer works as a compiler and checks the source code for logical errors and searches for parts of the code where more optimal logic can be used. The program helps in eliminating unused variables and other problems with memory management.
Allocations Instrument. Allocations Instrument is used to check the quality of application performance. By testing the program with the help of Allocations, you can identify situations with memory loss. During testing, a snapshot of the program state is taken and some actions are performed, then the cancellation and return of the program to its original state. If the memory allocated for the operation remains at the same level, there is no problem. This is the simplest scenario: performing some operations in the program, and then returning to the state preceding these actions.
Leaks Instrument. Leaks Instrument keeps track of memory leaks while the program is running. Leaks lead to the fact that the memory consumption of the program increases uncontrollably, as a result, sooner or later the architectural limitations of the environment come into effect and a new memory allocation is impossible. Such leaks lead to the emergency closure of the program. If the application captures most of the memory, and the user decides to minimize it, the “watchdog” will have nothing left to do but forcefully unload the program to free up resources.
Zombies instrument. Most application failures are caused by calls to non-existent objects. During operation, the memory is constantly allocated and released, and if the process gives up resources before the application has time to turn to them, it crashes. The script is very difficult to track with a simple debugger. Zombies instrument leaves empty or “dead” objects in place of the released processes. These objects are “zombies”, which are accessed because of incorrect logic in the code and stop the execution of the program. “Zombies” accept erroneous calls and define lines in the code that cause the program to close unexpectedly.
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Time Profiler. Time Profiler can work in a simulator, although Apple recommends using it on real devices. The main reason is the difference in performance between the Mac simulator and the iOS device. Apple recommends taking measurements on the weakest models, for example, on iPhone 3G with iOS 4. The main function of Time Profiler is to measure the execution time of each piece of code, which allows developers to see the parts that need fixing. Some points can be rewritten, for example, by removing the logic from the main thread using Blocks and the Grand Central Dispatch. Despite the fact that Apple has greatly simplified the implementation of such tasks, developers are reluctant to spend time optimizing their code.
Energy Diagnostics. A tool called Energy Diagnostics, perhaps the most interesting of all that Apple has proposed. Energy Diagnostics allows testing in the field as close to real as possible. The collected data is then analyzed to estimate the battery consumption of each function. The tool tells developers how long each component of the device is used. If you need to know the location of the user, Energy Diagnostics will show which components are included in the work and calculate the elapsed time. GPS is one of the most difficult components in terms of battery consumption. Therefore, the right developers turn off discovery services right after they finish their work. Energy Diagnostics helps you configure optimal use of device resources.
Crash Reports. iTunes Connect is used by developers to interact with the App Store and send applications to Apple. There is also a collection of data on software failures on users' devices. Reports are available to developers for analyzing bottlenecks in the code and contain usage statistics: idle time of “observers” (watchdog) at startup, recovery or pauses in the programs and a description of the situation when the user or the system forced the application to work. Crash Reports helps to fix bugs that were not detected during field testing.