Calling UIKit methods from other threads

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I have a function that must be called from a non-main thread. In that thread, I am trying to determine status bar orientation like this:

   let currentInterfaceOrientation = UIApplication.shared.statusBarOrientation

But I obviously get a run time warning like this.

    UIApplication.statusBarOrientation() must be used from main thread only

My question is how to determine status bar orientation on secondary thread if you need it? Using DispatchQueue.main.sync is the right way but is risky for the reasons of potential deadlocks.

   var currentInterfaceOrientation = UIInterfaceOrientation.landscapeLeft



   DispatchQueue.main.sync {

                currentInterfaceOrientation = UIApplication.shared.statusBarOrientation

            }

What are the safe ways here using Swift?

edited Nov 11 at 12:04

asked Nov 11 at 11:58

Deepak Sharma

1,2861637

add a comment |

up vote
0
down vote

favorite

I have a function that must be called from a non-main thread. In that thread, I am trying to determine status bar orientation like this:

   let currentInterfaceOrientation = UIApplication.shared.statusBarOrientation

But I obviously get a run time warning like this.

    UIApplication.statusBarOrientation() must be used from main thread only

My question is how to determine status bar orientation on secondary thread if you need it? Using DispatchQueue.main.sync is the right way but is risky for the reasons of potential deadlocks.

   var currentInterfaceOrientation = UIInterfaceOrientation.landscapeLeft



   DispatchQueue.main.sync {

                currentInterfaceOrientation = UIApplication.shared.statusBarOrientation

            }

What are the safe ways here using Swift?

edited Nov 11 at 12:04

asked Nov 11 at 11:58

Deepak Sharma

1,2861637

add a comment |

up vote
0
down vote

favorite

I have a function that must be called from a non-main thread. In that thread, I am trying to determine status bar orientation like this:

   let currentInterfaceOrientation = UIApplication.shared.statusBarOrientation

But I obviously get a run time warning like this.

    UIApplication.statusBarOrientation() must be used from main thread only

My question is how to determine status bar orientation on secondary thread if you need it? Using DispatchQueue.main.sync is the right way but is risky for the reasons of potential deadlocks.

   var currentInterfaceOrientation = UIInterfaceOrientation.landscapeLeft



   DispatchQueue.main.sync {

                currentInterfaceOrientation = UIApplication.shared.statusBarOrientation

            }

What are the safe ways here using Swift?

edited Nov 11 at 12:04

asked Nov 11 at 11:58

Deepak Sharma

1,2861637

I have a function that must be called from a non-main thread. In that thread, I am trying to determine status bar orientation like this:

   let currentInterfaceOrientation = UIApplication.shared.statusBarOrientation

But I obviously get a run time warning like this.

    UIApplication.statusBarOrientation() must be used from main thread only

My question is how to determine status bar orientation on secondary thread if you need it? Using DispatchQueue.main.sync is the right way but is risky for the reasons of potential deadlocks.

   var currentInterfaceOrientation = UIInterfaceOrientation.landscapeLeft



   DispatchQueue.main.sync {

                currentInterfaceOrientation = UIApplication.shared.statusBarOrientation

            }

What are the safe ways here using Swift?

ios swift multithreading uikit ios-multithreading

edited Nov 11 at 12:04

asked Nov 11 at 11:58

Deepak Sharma

1,2861637

edited Nov 11 at 12:04

asked Nov 11 at 11:58

Deepak Sharma

1,2861637

edited Nov 11 at 12:04

asked Nov 11 at 11:58

Deepak Sharma

1,2861637

asked Nov 11 at 11:58

Deepak Sharma

1,2861637

asked Nov 11 at 11:58

Deepak Sharma

1,2861637

add a comment |

1 Answer
1

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up vote
1
down vote

I have a function that must be called from a non-main thread.

Add the orientation as an argument to this function.

answered Nov 11 at 13:33

messeb

17118

Problem is there is a chain of functions and this one sits at the top of the stack, all these functions are called on secondary thread.
– Deepak Sharma
Nov 11 at 15:46

1

Could you give a small code example? I can't imagine that it is not possible to inject a dependency. To access UIApplication.shared directly is a little code smell. The easiest solution would be to create another global Object, where you set the orientation from UIApplication.shared.statusBarOrientation
– messeb
Nov 11 at 15:56

add a comment |

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1 Answer
1

active

oldest

votes

1 Answer
1

active

oldest

votes

up vote
1
down vote

I have a function that must be called from a non-main thread.

Add the orientation as an argument to this function.

answered Nov 11 at 13:33

messeb

17118

Problem is there is a chain of functions and this one sits at the top of the stack, all these functions are called on secondary thread.
– Deepak Sharma
Nov 11 at 15:46

1

Could you give a small code example? I can't imagine that it is not possible to inject a dependency. To access UIApplication.shared directly is a little code smell. The easiest solution would be to create another global Object, where you set the orientation from UIApplication.shared.statusBarOrientation
– messeb
Nov 11 at 15:56

add a comment |

up vote
1
down vote

I have a function that must be called from a non-main thread.

Add the orientation as an argument to this function.

answered Nov 11 at 13:33

messeb

17118

Problem is there is a chain of functions and this one sits at the top of the stack, all these functions are called on secondary thread.
– Deepak Sharma
Nov 11 at 15:46

1

Could you give a small code example? I can't imagine that it is not possible to inject a dependency. To access UIApplication.shared directly is a little code smell. The easiest solution would be to create another global Object, where you set the orientation from UIApplication.shared.statusBarOrientation
– messeb
Nov 11 at 15:56

add a comment |

up vote
1
down vote

I have a function that must be called from a non-main thread.

Add the orientation as an argument to this function.

answered Nov 11 at 13:33

messeb

17118

I have a function that must be called from a non-main thread.

Add the orientation as an argument to this function.

answered Nov 11 at 13:33

messeb

17118

answered Nov 11 at 13:33

messeb

17118

answered Nov 11 at 13:33

messeb

17118

answered Nov 11 at 13:33

messeb

17118

Problem is there is a chain of functions and this one sits at the top of the stack, all these functions are called on secondary thread.
– Deepak Sharma
Nov 11 at 15:46

1

Could you give a small code example? I can't imagine that it is not possible to inject a dependency. To access UIApplication.shared directly is a little code smell. The easiest solution would be to create another global Object, where you set the orientation from UIApplication.shared.statusBarOrientation
– messeb
Nov 11 at 15:56

add a comment |

Problem is there is a chain of functions and this one sits at the top of the stack, all these functions are called on secondary thread.
– Deepak Sharma
Nov 11 at 15:46

1

Could you give a small code example? I can't imagine that it is not possible to inject a dependency. To access UIApplication.shared directly is a little code smell. The easiest solution would be to create another global Object, where you set the orientation from UIApplication.shared.statusBarOrientation
– messeb
Nov 11 at 15:56

Problem is there is a chain of functions and this one sits at the top of the stack, all these functions are called on secondary thread.
– Deepak Sharma
Nov 11 at 15:46

Could you give a small code example? I can't imagine that it is not possible to inject a dependency. To access UIApplication.shared directly is a little code smell. The easiest solution would be to create another global Object, where you set the orientation from UIApplication.shared.statusBarOrientation
– messeb
Nov 11 at 15:56

add a comment |

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