Memory leak on Allocations - ios

Question

I'm a beginner and still trying to figure out how to read this.
There are 3 custom views and at the start I allocate the first one.
And then the second / deallocate the first and then the third / deallocate the second.
I do empty/nil all arrays right before deallocating each view so from what I see, all memory retained each time I allocated views, should be released whenever I deallocate/nil them but in the graph it keeps increasing, I don't see anything being released at all.
Is that supposed to look like that? I'm nil-ing delegates, arrays, dictionaries etc everything.
-(void)firstTOsecond {
[self.first removeFromSuperview];
self.first.delegate = nil;
self.first = nil;
self.second = [[Second alloc]initWithFrame:CGRectMake(0, 0, self.view.frame.size.width, self.view.frame.size.height)];
[self.view addSubview:self.second];
self.second.delegate = self;}
-(void)secondTOthird {
[self.second removeFromSuperview];
self.second.delegate = nil;
self.second = nil;
self.third = [[Third alloc]initWithFrame:CGRectMake(0, 0, self.view.frame.size.width, self.view.frame.size.height)];
[self.view addSubview:self.third];
self.third.delegate = self;}
EDIT
In First.m / Second.m / Third.m
-(instancetype)initWithFrame:(CGRect)frame {
self = [super initWithFrame:frame];
if (self) {
self.buttonStartFrame = [[UIImageView alloc]initWithImage:[UIImage imageNamed:#"buttonStartFrame"]];
[self addSubview:self.buttonStartFrame];
self.buttonStartFrame.userInteractionEnabled = YES;
self.buttonStartButton = [[UIImageView alloc]initWithImage:[UIImage imageNamed:#"buttonStartDefault"]];
[self.buttonStartFrame addSubview:self.buttonStartButton];
self.buttonStartButton.userInteractionEnabled = YES;
self.labelStart = [[UILabel alloc]init];
[self.buttonStartButton addSubview:self.labelStart];
self.labelStart.textColor = [UIColor darkGrayColor];
self.labelStart.text = #"Start";
}
return self;}

Answer 1

the memory leak could be that you are continuously creating new view elements when they could be updated instead .. you can create helper methods to avoid allocating new views, and updating the one's on the main thread instead
- (void)limitedUpdateTextColorView:(NSDictionary *)somethingCache {
self.labelStart.textColor = [somethingCache valueForKey:#"bar"];
self.labelStart.text = [somethingCache valueForKey:#"foo"];
}