A for Alpha

A for Alpha has asked 20 questions and find answers to 4 problems.

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iOS application developer and a huge steve Jobs fan. The beauty of the apple products motivated me to be a iOS apps developer and i am in love with it... :)

A for Alpha questions

Unable to invalidate (Stop) NSTimer [duplicate]
Cannot create an NSPersistentStoreCoordinator with a nil model error
What is an Ad Hoc certificate for iOS test app distribution?
How to control the number of simultaneous touches on a view in iOS
Setting static content in a UIScrollView through XIB
How to change the frame of UIKeyBoard programmatically in iOS
How to pause/resume downloads in iPhone (iOS)
NSNotification being raised multiple times
How to set the UIButton state to be highlighted after pressing it
unable to upload file using NSURLSession multi-part form data in iOS

A for Alpha answers

Cannot create an NSPersistentStoreCoordinator with a nil model error
NSNotification being raised multiple times
How to Handle SIGKILL,SIGABRT, Signal-0 exceptions through Exception Handling in iPhone programming