Vadoff Vadoff - 10 months ago 178
iOS Question

Super slow lag/delay on initial keyboard animation of UITextField

Alright, this problem has been driving me nuts.

It takes roughly 3-4 seconds for the keyboard to pop up after I touch my

. This only occurs on the first time the keyboard pops up since the app launched, afterwards the animation starts instantly.

At first I thought it was problem of loading too many images, or my
, but I just created a brand new project with only a
, and I still experience this problem. I'm using iOS 5, Xcode ver 4.2, and running on an iPhone 4S.

This is my code:

#import "ViewController.h"

@implementation ViewController

- (void)viewDidLoad {
[super viewDidLoad];

UITextField *textField = [[UITextField alloc] initWithFrame:CGRectMake(20, 20, 280, 30)];
textField.borderStyle = UITextBorderStyleRoundedRect;
textField.delegate = self;
[self.view addSubview:textField];


Is this a common problem for all apps?

Right now, the only way I can make it somewhat better is by having
become/resign first responder in
, but that doesn't solve the problem entirely - it just loads the delay onto when the view loads instead. If I click on
immediately when the view loads, I still get the problem; if I wait 3-4 seconds after the view loads before touching the textField, I don't get the delay.


So the problem is NOT just limited to the first install as I had previously thought, but happens every time the app is launched. Here's my solution that solves the issue completely.

- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions {
  // Preloads keyboard so there's no lag on initial keyboard appearance.
  UITextField *lagFreeField = [[UITextField alloc] init];
  [self.window addSubview:lagFreeField];
  [lagFreeField becomeFirstResponder];
  [lagFreeField resignFirstResponder];
  [lagFreeField removeFromSuperview];