Prevent Screen Lock iOS

Bischi

Does anybody know how to access ios options. For example I want to prevent the screen lock.

How can that be done?

SGaist

Hi,

Using Apple public API's you can't. If you want to avoid your application going to sleep then idleTimerDisabled is what you are looking for

Kenz Dale

6 years on, this is a useful tidbit of information, but how specifically does one go about setting isIdleTimerDisabled?

It is documented here, https://developer.apple.com/documentation/uikit/uiapplication/1623070-isidletimerdisabled, but unfortunately that is Apple-language specific. How does one do this in the context of a Qt project?

SGaist

You use Objective-C++ and call

[UIApplication sharedApplication].idleTimerDisabled = YES;

in a dedicated function.

Kenz Dale

Thanks, that's short and sweet. Would you have a link to a minimal example of setting up an Objective-C function in this manner?

SGaist

@benlau has good examples in his project.

Kenz Dale

Thanks for the pointer, here's how I solved it:

main.c

// Check for Apple platforms
#if __APPLE__
#include <TargetConditionals.h>
#if TARGET_IPHONE_SIMULATOR
    // iOS Simulator
    #include "objective-c/setIosParameters.h" 
#elif TARGET_OS_IPHONE
    // iOS device
    #include "objective-c/setIosParameters.h" 
#elif TARGET_OS_MAC
    // Other kinds of macOS
#else
#   error "Unknown Apple platform"
#endif
#endif  // __APPLE__


int main(int argc, char *argv[])
{
   qDebug() << "Initializing application";

#if TARGET_OS_IPHONE || TARGET_IPHONE_SIMULATOR
   // Set any required IOS parameters
   setIosParams();
#endif  // TARGET_OS_IPHONE
.
.
.
}

setIosParameters.h

#ifndef SETIOSPARAMETERS_H
#define SETIOSPARAMETERS_H

// Header to point toward Objective-C functions necessary for iOS deployment
void setIosParams();

// Header to point toward Objective-C functions necessary for iOS deployment
void setIosParams();

#endif   // SETIOSPARAMETERS_H

setIosParameters.mm

#include "setIosParameters.h"
#include <UIKit/UIKit.h>
#include <CoreLocation/CoreLocation.h>

void setIosParams()
{
   // Configure the phone to application to keep the phone screen awake
   [UIApplication sharedApplication].idleTimerDisabled = YES;

   // Set the GPS to maximum accuracy
   [[CLLocationManager alloc] init].desiredAccuracy = kCLLocationAccuracyBestForNavigation;
}

P.S. Included for good measure is setting the Location Manager's desiredAccuracy to kCLLocationAccuracyBestForNavigation.