Figure 6-42 [PhoneSettingsController myNumber:]
The implementation of [PhoneSettingsController myNumber:] is rather straightforward.
This method simply checks whether the length of [[PhoneSettingsTelephony telephony]
myNumber] is 0. If it is not 0, it is returned as my number, otherwise this method returns an
“unknown number” as an error reminder. Let’s test [[PhoneSettingsTelephony telephony]
myNumber] with Cycript:
FunMaker-5:~ root# cycript -p Preferences
cy# [[PhoneSettingsTelephony telephony] myNumber]
@"+86PhoneNumber"Now, press home button to quit Preferences, then terminate it completely and make sure
it’ s not running in the background. After that, launch it again and don’t enter
MobilePhoneSettings for now, let’s test this method again:
FunMaker-5:~ root# cycript -p Preferences
cy# [[PhoneSettingsTelephony telephony] myNumber]
ReferenceError: Can’t find variable: PhoneSettingsTelephonyAn error happens. What’s wrong? The reason is that PhoneSettingsTelephony is a class of
MobilePhoneSettings.bundle. If we don’t enter MobilePhoneSettings, this bundle will not be
loaded, so this class doesn’t exist. In other words, this method will only work after
MobilePhoneSettings.bundle is loaded. The way Preference.app loads
MobilePhoneSettings.bundle is called lazy load, which is common in iOS reverse engineering.
When you come across it, welcome to discuss with us on http://bbs.iosre.com.
So far, we can say we have already found the target function, because we have got both the
caller and arguments of this method, plus no UI operation is involved, we can call this method
neatly. However, there is still a fly in the ointment: MobilePhoneSettings.bundle must be