UUIDWithString crash when input invalid param

Question

When I use [CBUUID UUIDWithString:@"xxx"], something like that the invalid uuid string, the app will crash. How to check if the param is a valid UUID-format.

The error is:

Assertion failure in -[CBUUID initWithString:], /BuildRoot/Library/Caches/com.apple.xbs/Sources/MobileBluetoothFramework/MobileBluetooth-115.5.1/CoreBluetooth/CoreBluetooth/CBUUID.m:149

I can't understand why the assertion happens on release version. Maybe Apple forget to turn off assertion switch.

where are you getting the UUID from, the system or are you creating one? — Asleepace, Mar 13 '19 at 02:47
The inputed UUID may from anywhere, but I need to make sure the app can't be crashed. So I have to make sure the input string is a valid format before I call UUIDWithString — zedzhao, Mar 13 '19 at 03:02

Asleepace · Answer 1 · 2019-03-13T03:13:19.187

0

Try this:

-(BOOL)isUUID:(NSString *)string
{
   return !![[NSUUID alloc] initWithUUIDString:string]; 
}

edited Mar 13 '19 at 03:13

answered Mar 13 '19 at 03:07

Asleepace

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YES， it can validate the full uuid format, but if you use '0FFE' the short term, the NSUUID will return nil. – zedzhao Mar 13 '19 at 03:16
@zedzhao in that case you may need to just to a regex yourself, check out this link: https://stackoverflow.com/questions/20652833/how-to-check-the-validity-of-a-guid-or-uuid-using-nsregularexpression-or-any-o – Asleepace Mar 13 '19 at 03:17
What's the use of `!!` here? – rmaddy Mar 13 '19 at 03:21
@rmaddy double cast to bool – Asleepace Mar 13 '19 at 03:21
Why not use `return [[NSUUID alloc] initWithUUIDString:string] != nil;` – rmaddy Mar 13 '19 at 03:22
@rmaddy ya you’re right, been in JS land too long today, I’ll update when I get back – Asleepace Mar 13 '19 at 03:23
The regex can't validate shortened format, like '0FFE' is valid but '0FFFF' is invalid. – zedzhao Mar 13 '19 at 03:31
@zedzhao check the length then first? – Asleepace Mar 13 '19 at 03:32
seems there is no better way. – zedzhao Mar 13 '19 at 03:36

UUIDWithString crash when input invalid param

1 Answers1