Custom UITextField delegate set to self initiates infinite loop - ios

Question

I am writing iPhone App in which I need custom UITextField class. For my text fields I need indent, image inside before the text and max characters. For this reason I created custom class based on UITextField. All my text fields will be based on this new class. I use Google and searched Stackoverflow and I find that in cases like mine I have to use self.delegate = self; during the init so I don't need to implement methods like textFieldShouldBeginEditing or textFieldShouldEndEditing inside my View Controller class. All my text fields will be created in storyboard so initWithCoder. As a result I receive infinite loop and App crash (I use simulator at this moment) after typing 1, 2 or 3 symbols. It is interesting that for numeric keyboard or password keyboard there is no such issue. Also if I type symbols on my Mac keyboard instead on the simulator there is no problem. I tried to debug but during the crash it jumps directly into loop and exist with error.
How to overcome this problem?
P.S. I asked question when I receive infinite loop and there was comments that self.delegate = self; can cause such loop, but I see that this statement is widely used. May be I did not do this correctly, but I can not figure out how to make reusable class out of UITextField.
EDIT:
Here is my code:
On inti I initialize and set border color:
- (id)initWithCoder:(NSCoder *)aDecoder{
self = [super initWithCoder:aDecoder];
if (self) {
self.layer.borderColor=[[UIColor blackColor] CGColor];
self.delegate = self;
}
return self;
}
When I start edit I change border color and set indent (indent set will be moved in property setter):
- (BOOL)textFieldShouldBeginEditing:(UITextField *)textField{
// Change border of text field that is editing to orange
textField.layer.masksToBounds=YES;
textField.layer.borderColor=[[UIColor orangeColor] CGColor];
textField.layer.borderWidth= 1.0f;
UIView *spacerView = [[UIView alloc] initWithFrame:CGRectMake(0, 0, _leftIndent, 10)];
[self setLeftViewMode:UITextFieldViewModeAlways];
[self setLeftView:spacerView];
return YES;
}
On finish editing I return back color:
- (BOOL)textFieldShouldEndEditing:(UITextField *)textField{
// Change border of text field that is edited to black
textField.layer.masksToBounds=YES;
textField.layer.borderColor=[[UIColor blackColor] CGColor];
textField.layer.borderWidth= 1.0f;
return YES;
}
And on value change I check max characters:
- (BOOL)textField:(UITextField *)textField shouldChangeCharactersInRange:(NSRange)range replacementString:(NSString *)string{
// Restrict number of symbols in text field to "maxSymbols"
NSUInteger oldLength = [textField.text length];
NSUInteger replacementLength = [string length];
NSUInteger rangeLength = range.length;
NSUInteger newLength = oldLength - rangeLength + replacementLength;
BOOL returnKey = [string rangeOfString: #"\n"].location != NSNotFound;
return newLength <= (int)_maxSymbols || returnKey;
}

Answer 1

I don't know if this can be actual answer, but I have work around which is the answer of my next question How properly subclass UITextField in iOS? (from justafinger). I don't make assignment self.delegate = self; in my custom control, but I have methods that are called from delegates in view controller.
I hope this can help people with problem like mine.