I have a very old app where I have UIPickerView where delegate method is called n number of times & because of which application is crashing.
Below is what I have.
I have already connection UIPickerView to its delegates.
I have label and on tapping on it, I am showing gender in uipickerview.
langLabel.userInteractionEnabled = YES;
UITapGestureRecognizer *tapGestureRecognizergenderLabel = [[UITapGestureRecognizer alloc] initWithTarget:self action:@selector(genderLabelTapped)];
tapGestureRecognizergenderLabel.numberOfTapsRequired = 1;
[langLabel addGestureRecognizer:tapGestureRecognizergenderLabel];
[tapGestureRecognizergenderLabel release];
-(void) genderLabelTapped {
NSLog(@"genderLabelTapped");
[normalPicker reloadAllComponents];
normalPicker.hidden = NO;
pickerImage.hidden = NO;
continueButton.userInteractionEnabled = NO;
}
I have delegates as below.
#pragma mark -
#pragma mark PickerView DataSource
- (NSInteger)numberOfComponentsInPickerView:(UIPickerView *)pickerView
{
NSLog(@"numberOfComponentsInPickerView");
return 1;
}
-(UIView *)pickerView:(UIPickerView *)pickerView viewForRow:(NSInteger)row forComponent:(NSInteger)component reusingView:(UIView *)view
{
CGRect screenRect = [[UIScreen mainScreen] bounds];
CGFloat screenHeight = screenRect.size.height;
if (screenHeight==568) {
[pickerView setFrame: CGRectMake(10, 332, 300, 216)];
} else {
[pickerView setFrame: CGRectMake(10, 244, 300, 216)];
}
UILabel *label = [[UILabel alloc] initWithFrame:CGRectMake(0, 0, 204, 44)]; // your frame, so picker gets "colored"
label.textColor = [UIColor blackColor];
label.font = [UIFont fontWithName:[NSString stringWithFormat:@"%@", localize(@"myFontNameB")] size:14];
label.textAlignment = NSTextAlignmentCenter;
label.text = [NSString stringWithFormat:@"%@", [arrayGender objectAtIndex:row]];
NSLog(@"changing font 1111...===%@", [arrayGender objectAtIndex:row]);
return label;
}
- (NSInteger)pickerView:(UIPickerView *)pickerView numberOfRowsInComponent:(NSInteger)component
{
return [arrayGender count];
}
- (NSString *)pickerView:(UIPickerView *)pickerView titleForRow:(NSInteger)row forComponent:(NSInteger)component
{
return [arrayGender objectAtIndex:row];
}
Gender array I have is as below.
arrayGender = [[NSMutableArray alloc] init];
[arrayGender addObject:@"ENGLISH"];
[arrayGender addObject:@"العربية"];
Whenever I run this code, I always see below output...
Oct 24 12:36:25 HardTask-iPad AppName[543] <Warning>: changing font 1111...===ENGLISH
Oct 24 12:36:25 HardTask-iPad AppName[543] <Warning>: changing font 1111...===العربية
Oct 24 12:36:25 HardTask-iPad AppName[543] <Warning>: changing font 1111...===ENGLISH
Oct 24 12:36:25 HardTask-iPad AppName[543] <Warning>: changing font 1111...===العربية
Oct 24 12:36:25 HardTask-iPad AppName[543] <Warning>: changing font 1111...===ENGLISH
Oct 24 12:36:25 HardTask-iPad AppName[543] <Warning>: changing font 1111...===العربية
Oct 24 12:36:25 HardTask-iPad AppName[543] <Warning>: changing font 1111...===ENGLISH
Oct 24 12:36:25 HardTask-iPad AppName[543] <Warning>: changing font 1111...===العربية
.
.
.
Oct 24 12:36:26 HardTask-iPad AppName[543] <Warning>: changing font 1111...===ENGLISH
Oct 24 12:36:26 HardTask-iPad AppName[543] <Warning>: changing font 1111...===العربية
Oct 24 12:36:26 HardTask-iPad AppName[543] <Warning>: changing font 1111...===ENGLISH
Oct 24 12:36:26 HardTask-iPad AppName[543] <Warning>: changing font 1111...===العربية
Any idea what is going wrong?
When you setFrame
of UIPickerView
it will call -(UIView *)pickerView:(UIPickerView *)pickerView viewForRow:(NSInteger)row forComponent:(NSInteger)component reusingView:(UIView *)view
.
In this case, to stop the loop, remove:
if (screenHeight==568) {
[pickerView setFrame: CGRectMake(10, 332, 300, 216)];
} else {
[pickerView setFrame: CGRectMake(10, 244, 300, 216)];
}
P/s: If you want to change anything of an object in its delegate/callback methods, do carefully.