Is there a way I can use the "Slide to Unlock" slider?

[williamlegate]

Originally Posted by mycatsnameisbernie

After spending way too much time on this, I finally have some code that I am happy with. I solved the two problems from my previous post as follows:

1. I added the full image of the track as a UIImageView instead of making it the UISlider's background image. This avoids the "squishing" of the edges of the track as the slider moves. It also allows the UISlider to be smaller than the track, so there is no longer a need to add transparent padding to the thumb image.
2. I implemented the "shimmering" text animation using the method in this post.

You can download an XCode project containing my code here.

There are 2 issues that could use improvement if anyone else wants to try...

1. The text animation is done using a repeating NSTimer to programatically shift the text highlighting. I would have preferred to have the iPhone's graphics engine perform the animation. I couldn't figure out how to do this with Core Animation on the iPhone. I think it could be done with CA on OS X using CALayer mask layers, but mask layers are not supported on iPhone OS. It might be possible with OpenGL, but I don't have any expertise in that area.
   
2. The text rendering code only supports Roman alphabets. In order to support Asian or other non-Roman alphabets, the text drawing code needs to be modified to use glyphs instead of characters.

Hope this helps...

Hmmmm... It looks like the iPhone SDK 4 makes it so that the default slider track appears over the custom slider track. Does anyone have a fix for this?

[noxlist]

Originally Posted by williamlegate

Hmmmm... It looks like the iPhone SDK 4 makes it so that the default slider track appears over the custom slider track. Does anyone have a fix for this?

/ CODE

[slider setMinimumTrackImage:[UIImage alloc] forState:UIControlStateNormal];
[slider setMaximumTrackImage:[UIImage alloc] forState:UIControlStateNormal];

[cibi84]

I need information you can use that, as slide to unlock key to be able to open a video?

[sbudhram]

I'm using this class and have found it extremely useful

In my setup, there's one thing I've noticed that causes this class to crash when it is released. I've modified the code quite a bit since getting it, but I figured some of you might be running into the same issue, so I post it here.

The 'loadView' method is setting the label's layer's delegate to self. The SDK documentation says this is explicitly prohibited for CALayers, and should only be set to the main view (which would be label, not the controller). This was causing me to crash on deallocation of this instance. To fix, I set:

label.layer.delegate = nil;

in my deallocation method.

Hope this helps someone... took me a day to nail it down.

[WRXFlyer]

Does anyone have this active in their app? I have heard that using the slider will cause a rejection.

[mycatsnameisbernie]

Originally Posted by WRXFlyer

Does anyone have this active in their app? I have heard that using the slider will cause a rejection.

Apple recently received a patent on slide-to-unlock: Apple awarded patents for Slide to Unlock, keyboard letter pop So I would guess they would not be happy about use of this code in an app.

Although this code ran great for me in the simulator, I found it performed very poorly on the real device. So I never used it in my app. I think the best way to improve performance on the device would be to get rid of the UISlider, and track touches movement in the enclosing view. Use the tracked touches to move the thumb image. But do this at your own risk of rejection.

[me0007]

Has anybody used this in an app available on the app store? I.e. has anybody experienced trouble with getting his app authorized if this slider is used?

I would like to know because otherwise I would think of using something else...

TIA,

Steve