Initialization code

gistfile1.m

@interface AutoScrollView ()

- (id) commonInit __attribute__((objc_method_family(init)));

@property(nonatomic, assign, getter=isAutoScrolling) BOOL autoScrolling;
@property(nonatomic, retain) NSTimer *autoScrollTimer, *delayedStartScrollingTimer;
@property(nonatomic, retain) UIGestureRecognizer *tapRecognizer;

@end

@implementation AutoScrollView {
	BOOL autoScrollWasDelayed;
}

@synthesize autoScrolling;
@synthesize autoScrollTimer, delayedStartScrollingTimer;
@synthesize tapRecognizer;

@synthesize delegate;

- (id) commonInit {
	//(With the init attribute) Analyzer: Instance variable used while 'self' is not set to the result of '[(super or self) init...]'
	tapRecognizer = [[UITapGestureRecognizer alloc] initWithTarget:self action:@selector(toggleAutoScrolling)];
	[self addGestureRecognizer:tapRecognizer];
	return self;
}
- (id) initWithCoder:(NSCoder *)decoder {
	if ((self = [super initWithCoder:decoder])) {
		self = [self commonInit];
	}
	//(If commonInit does not have the init attribute) Analyzer: Returning 'self' while it is not set to the result of '[(super or self) init...]'
	return self;
}
- (id) initWithFrame:(CGRect)frame {
	if ((self = [super initWithFrame:frame])) {
		self = [self commonInit];
	}
	//(If commonInit does not have the init attribute) Analyzer: Returning 'self' while it is not set to the result of '[(super or self) init...]'
	return self;
}

Why not do -(void)commonInit instead? Or even do it with a static function if you want to avoid subclasses breaking you.