fatal error: unexpectedly found nil while unwrapping an Optional value
2892
What does "Fatal error: Unexpectedly found nil while unwrapping an Optional value" mean?
133619
In Objective-C why should I check if self = [super init] is not nil?
119473
Where and how should I instantiate an object which will be used globally in an IOS app?
113944
How do I lookup a string constant at runtime in Objective-C?
46477
How to understand nil vs. empty vs. blank in Ruby
107369
Catchable fatal error: Object of class mysqli_result could not be converted to string
68676
Testing for nil in Objective-C -- if(x != nil) vs if(x)
87456
How to avoid collision between optional arguments and options
156990
NSInvalidArgumentException', reason: 'Unknown predicate type for predicate: BLOCKPREDICATE(0x70ad750)' Error
143850
collection_select, undefined method `map' for nil:NilClass
58309
Error: unrecognized selector sent to instance
65589
How will I be able to remove [NSNull Null] objects from NSMutableArray?
111437
Weak NSString variable is not nil after setting the only strong reference to nil
106465
iOS: Usage of self and underscore(_) with variable
4858
Weird Switch error in Obj-C
27280
"unrecognized selector sent to instance" error in Objective-C
6292
What is an undefined reference/unresolved external symbol error and how do I fix it?