Check private headers against new class-dumps.
python check.py iPhonePrivate.h SpringBoard/
This assumes your extension lists all the private APIs it uses in a single header file. Here's an example from one of my projects:
@interface SBIconController : NSObject
+ (id)sharedInstance;
@property (assign) BOOL isEditing;
@property (retain) SBFolder *openFolder;
@end
@interface SBAwayController : SBAlert
+ (id)sharedAwayController;
- (BOOL)isLocked;
@end
@interface SBBulletinWindowController : NSObject
@property(readonly, assign, nonatomic) UIWindow *window;
@property(readonly, assign, nonatomic) UIInterfaceOrientation windowOrientation;
+ (id)sharedInstance;
- (BOOL)allowsDismissBannerGesture;
- (BOOL)allowsHideNotificationsGesture;
- (BOOL)allowsShowNotificationsGesture;
- (BOOL)isBusy;
@end
@interface SBLinenView : UIView
@end
Since I only list the classes and methods I actually use, this tool simply checks to see if those methods still exist.
A folder with a collection of header files for the version of the binary you want to compare against. I suggest using class-dump-z and its -H option to create it. For many extensions, you'll want to use SpringBoard; however, some may want UIKit or a different binary altogether.
- It can't scan your source code to see what methods you call. You'll have to list all the private methods you use in a header file.
- It can't tell you about instance variable changes.
- It can't handle methods with blocks, and will probably simply crash with function pointers.
- Most importantly, this cannot discover if the semantics of any of these methods changed. This is just a starting point for porting work.