Luca questions

• ld: library not found for -lz
• Application failed codesign verification. The signature was invalid, contains disallowed entitlements
• Invalid nib registered for identifier ((null)) - nib must contain exactly one top level
• How to pass a string as a tag of UIButton
• this class is not key value coding-compliant for the key XXXXXX
• Getting Longitude/Latitude of the User When the viewDidLoad
• Can not launch the app on device
• Exception : 'Invalid Region <center:+inf, +0.00000000 span:+1.00000000, +0.50000000>' when trying to display the map
• Foreign Key constraint doesn't work
• didFailWithError: Error Domain=kCLErrorDomain Code=0 "The operation couldn’t be completed. (kCLErrorDomain error 0.)"

Luca answers