What's a reliable way to make an iOS app crash?

a wrong `NSLog` statement will do it

NSLog(@"%@",1);

How about a good old stack overflow :)

- (void)stackOverflow
{
[self stackOverflow];
}

I use

[self doesNotRecognizeSelector:_cmd];

Send a message to a deallocated object

When working with RubyMotion I use this:

n=Pointer.new ('c', 1)
n[1000] ='h'

in Objective-C use C directly to cause a bad access

strcpy(0, "bla");

*Note: while this works on any system I know -- in a future version of the C runtime OR the compiler this might not lead to a crash anymore. see

[To see links please register here]

)*

(in swift you would have to bridge to objC to do this)

Try this:

- (IBAction)Button:(id)sender
{
NSArray *array = [NSArray new];
NSLog(@"%@",[array objectAtIndex:8]);
}

I think in Swift you could easily throw a fatal error:

func foo() {
fatalError("crash!")
}

It is actually even intended to use this feature in case something goes wrong in order to make the app crash.

To avoid an if statement in a special case, you could use `precondition`, too. It's similar to `assert`, makes thus the intention (if wanted) pretty clear and is _not_ removed in the final release as `assert`. It is used like `precondition(myBoolean, "This is a helpful error message for debugging.")`.

Most popular one - unrecognised selector crash:

NSObject *object = [[NSObject alloc] init];
[object performSelector:@selector(asfd)];
Make sure you don't have -asdf method implemented in that class haha

Or index beyond bound exception:

NSArray * array = [NSArray array];
[array objectAtIndex:5];

And of course
`kill( getpid(), SIGABRT );`