I Just realize how hard it was to just assign RGB Values color by code using UIColor, Well heres a little work around. Using the utilities in mac, which will you can find at Applications/Utilities folder. Open it.
Make sure you selected "RGB As Percentage", Use your mouse to move the cursor over the pixel you want to sample, and read off the values, once you got the color you want; press Command-Shift-H, This will hold the color values you got for the moment. Press F4 for Dashboard use calculator,
Divide the values you got to 100, for example R%: 78.8 = .788; Then you can finally put the RGB values on your UIColor parameter.
#define COLOR_FOR_THIS [UIColor colorWithRed:0.788f green:0.207f blue:0.271f alpha:1.0f]
Noobie Mistake while trying to traced memory leak with the app I am working on using the instrument provided by xcode , I got series of pink spikes,
and I'm not sure what was causing it, I thought that the managedObject Context was the culprit. I noticed tons of _NSZombie_ prefix listed and I remember that I added the NSZombieEnabled tag under the Argument in "Executable App Info",
I added NSZombieEnabled environment variable because it can be helpful to track down the elusive object causing the problem, mostly tracing the EXC_BAD_ACCESS error message. So after I disabled it, the app I am working on had no leak after all.
Make View move upward - UITextField Begin Editing
Attached is the video - what I was trying to do, it happens that my first iPhone app has UITextField positioned where the text keypad will appear also, which will hide the current UITextField. Well I realized that I will encounter this often, so I guess it's important to have this piece of code.
in your interface builder assign the UITextField as delegate
UITextField as delegate
on your .m file declare the static constant at the top of the code.
static const CGFloat KEYBOARD_ANIMATION_DURATION = 0.3; static const CGFloat MINIMUM_SCROLL_FRACTION = 0.2; static const CGFloat MAXIMUM_SCROLL_FRACTION = 0.8; static const CGFloat PORTRAIT_KEYBOARD_HEIGHT = 216; static const CGFloat LANDSCAPE_KEYBOARD_HEIGHT = 140;
after at the @implementation put this global variable to be used for all events
CGFloat animatedDistance;
at the textFieldDidBeginEditing event
- (void)textFieldDidBeginEditing:(UITextField *)textField { CGRect textFieldRect = [self.view.window convertRect:textField.bounds fromView:textField]; CGRect viewRect = [self.view.window convertRect:self.view.bounds fromView:self.view]; CGFloat midline = textFieldRect.origin.y + 0.5 * textFieldRect.size.height; CGFloat numerator = midline - viewRect.origin.y - MINIMUM_SCROLL_FRACTION * viewRect.size.height; CGFloat denominator = (MAXIMUM_SCROLL_FRACTION - MINIMUM_SCROLL_FRACTION) * viewRect.size.height; CGFloat heightFraction = numerator / denominator; if (heightFraction < 0.0) { heightFraction = 0.0; } else if (heightFraction > 1.0) { heightFraction = 1.0; } UIInterfaceOrientation orientation = [[UIApplication sharedApplication] statusBarOrientation]; if (orientation == UIInterfaceOrientationPortrait || orientation == UIInterfaceOrientationPortraitUpsideDown) { animatedDistance = floor(PORTRAIT_KEYBOARD_HEIGHT * heightFraction); } else { animatedDistance = floor(LANDSCAPE_KEYBOARD_HEIGHT * heightFraction); } CGRect viewFrame = self.view.frame; viewFrame.origin.y -= animatedDistance; [UIView beginAnimations:nil context:NULL]; [UIView setAnimationBeginsFromCurrentState:YES]; [UIView setAnimationDuration:KEYBOARD_ANIMATION_DURATION]; [self.view setFrame:viewFrame]; [UIView commitAnimations]; }
at textFieldDidEndEditing event
- (void)textFieldDidEndEditing:(UITextField *)textField { CGRect viewFrame = self.view.frame; viewFrame.origin.y += animatedDistance; [UIView beginAnimations:nil context:NULL]; [UIView setAnimationBeginsFromCurrentState:YES]; [UIView setAnimationDuration:KEYBOARD_ANIMATION_DURATION]; [self.view setFrame:viewFrame]; [UIView commitAnimations]; }
This event is textfield resign responder, once you press the return keypad it will hide the iPhone keyboard, this is important to test if the view will come back to its previous state.
-(BOOL)textFieldShouldReturn:(UITextField *) textField { [textField resignFirstResponder]; return YES; }
As a programmer me and my client Captain Coralyn will try our luck now with iPhone Developing.
