Xcode ‘duplicate symbol’ error while building with static library

Question: I have an Xcode 4.1 project that has a static library attached to it. That library handles my Twitter methods and it includes another static library, namely libOAuth.a. On building the app I keep getting “duplicate symbol” error. I build and run my app on 3.2 or 4.1 simulator without errors. When I build the very the same code for a device – for an iPhone 4GS or an iPad – I am getting the errors. I am sure nothing is duplicated. It seams that there are two different architectures (armv6, armv7) in the library and the Xcode can’t resolve them correctly. What is your experience? Continue reading →

iPhone project: failed to upload .app error in Xcode

Problem: I face a problem running a debug built application on an iPhone 3.1 device from Xcode 3.2.5 (iOS SDK 4.2). I receive the error message “Failed to upload my.app”. The app is actually uploaded but cannot be run. There is no error message in either device’s console or in the Xcode’s one. The application runs perfectly in the simulator and it runs without errors on iPad or iPhone 4GS devices. Proper .mobileprovision file is installed. What do you recommend? Continue reading →

Errors during ad hoc distribution in iPhone projects

On the request of our clients here you can find some typical error messages that may occur during ad hoc distribution of iPhone applications. The good news is our programmers know what points they used to miss. Continue reading →

Custom background of UITableView with grouped style

Question: I have an iPad project with iPhone SDK (Xcode) 4.1. The code must also run on iPhone 4. I cannot set the background of UITableView when the tableview style is “grouped”, not even with Interface Builder. It simply does not work:

[aTableView setBackgroundColor:[UIColor colorWithPatternImage:[UIImage imageNamed:@"background.png"]]];

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Subclassing UITableViewCell in iPhone app

Question: I created a custom UITableViewCell which should have a different appearance than the default implementation. I need to customize the appearance and/or position of standard iPhone red buttons of edit and delete confirmation that seems to be out of reach. Maybe my colleagues are completely on the wrong track here and maybe subclassing a UItableViewCell is a bad idea, but I have been told to do so. How? Continue reading →

Xcode warning: implicit declaration of NSStringFromRect

Question:

I have a quick question. I get xcode warning: implicit declaration of function ‘NSStringFromRect’ while building an iPad application. I want to NSLog CGRect values of frames in subviews. I was told to import ‘stdio.h’ for whatever reason but it did not help. Is there an gcc/xcode pragma to suppress warnings? Frustrating though.