Detect if you're currently running a development version or an App Store/Ad Hoc version.

DevelopmentEnviromentDetector.m

static BOOL PSPDFIsDevelopmentBuild(void) {
#if TARGET_IPHONE_SIMULATOR
    return YES;
#else
    static BOOL isDevelopment = NO;
    static dispatch_once_t onceToken;
    dispatch_once(&onceToken, ^{
        // There is no provisioning profile in AppStore Apps.
        NSData *data = [NSData dataWithContentsOfFile:[NSBundle.mainBundle pathForResource:@"embedded" ofType:@"mobileprovision"]];
        if (data) {
            const char *bytes = [data bytes];
            NSMutableString *profile = [[NSMutableString alloc] initWithCapacity:data.length];
            for (NSUInteger i = 0; i < data.length; i++) {
                [profile appendFormat:@"%c", bytes[i]];
            }
            // Look for debug value, if detected we're a development build.
            NSString *cleared = [[profile componentsSeparatedByCharactersInSet:NSCharacterSet.whitespaceAndNewlineCharacterSet] componentsJoinedByString:@""];
            isDevelopment = [cleared rangeOfString:@"<key>get-task-allow</key><true/>"].length > 0;
        }
    });
    return isDevelopment;
#endif
}

@steipete Good thinking

I tried this snippet in a production app a while back, this snippet caused a crash on ~0.1% of users.

What was the crash?

To avoid crashes I suggest to check only

+ (BOOL)isDevelopmentBuild {
#if TARGET_IPHONE_SIMULATOR
    return YES;
#else
    static BOOL isDevelopment = NO;
    static dispatch_once_t onceToken;
    dispatch_once(&onceToken, ^{
        // There is no provisioning profile in AppStore Apps.
        NSData *data = [NSData dataWithContentsOfFile:[NSBundle.mainBundle pathForResource:@"embedded" ofType:@"mobileprovision"]];
        if (data) {
            isDevelopment=YES;
        }
    });
    return isDevelopment;
#endif
}