Positioning UIViews

UIView+position is the most useful category I've come across - so good, I add it to my project's .pch so it's always available. Author Tyler Neylon made this available via a Apache 2 license. You can do all sorts of neat stuff e.g.

view1.frameY = view2.frameBottom
view1.frameWidth = view2.frameHeight

Xcode: How to turn off ARC on individual files

1. Click on the Project.
2. Click on the target.
3. Select build phases tab.
4. Select the multiple files in which you want to turn off ARC.
5. Press ENTER / Hit Enter key
6. Type “-fno-objc-arc” ( without quotes)

For more info: Source Link by Neon Spark

Adding a NIB view at runtime

// Add MyView.xib to a UIView, in IB associate MyView.xib and the MyView class

NSArray* nibViews = [[NSBundle mainBundle] loadNibNamed:@"MyView" owner:self options:nil];        

MyView* o = [nibViews objectAtIndex:0];

[self addSubview:o];

Showing invisible files and folders on the Mac

In Terminal:

defaults write com.apple.finder AppleShowAllFiles TRUE
killall Finder

to hide:

defaults write com.apple.finder AppleShowAllFiles FALSE
killall Finder

Xcode 4.2 doesn't generate a stack trace

Xcode 4.2 doesn't generate a stack trace when simulating iOS5. Choosing a 4.x (or older) target in the project's scheme menu will show a stack trace. The project build setting for 'iOS Deployment Target' has to be set to 4.x (or older) to see older scheme targets.