IOS RunLoop 1. iosrunloop

IOS RunLoop 1. iosrunloop

A RunLoop is like a loop of its name.

RunLoop has multiple modes.

You can only execute one mode at a time.

Therefore, when using RunLoop, pay attention that the effect may not be what you want.

Here we use NSTimer to demonstrate the simple implementation of Runloop.

Add a TextView to the story board for testing)

 

Let's add nstmode to NSDefaultRunLoopMode.

 

We can clearly see that nstimer is not executed when we scroll TextView.

/// ViewController. m // CX RunLoop analysis // Created by ma c on 16/3/29. // Copyright©2016 xubaoaichiyu. all rights reserved. // # import "ViewController. h "@ interface ViewController () @ end @ implementation ViewController-(void) viewDidLoad {[super viewDidLoad];}-(void) touchesBegan :( NSSet <UITouch *> *) touches withEvent :( UIEvent *) event {NSTimer * timer = [NSTimer timerWithTimeInterval: 3 target: self selector: @ selector (test) userInfo: nil repeats: YES]; // Add it to the default runloop [[[nsunloop mainRunLoop] addTimer: timer forMode: NSDefaultRunLoopMode]; [timer fire];}-(void) test {NSLog (@ "xubao loves fish");} @ end

Let's add nstmode to UITrackingRunLoopMode.

 

We can clearly see that nstimer is executed when we scroll TextView.

/// ViewController. m // CX RunLoop analysis // Created by ma c on 16/3/29. // Copyright©2016 xubaoaichiyu. all rights reserved. // # import "ViewController. h "@ interface ViewController () @ end @ implementation ViewController-(void) viewDidLoad {[super viewDidLoad];}-(void) touchesBegan :( NSSet <UITouch *> *) touches withEvent :( UIEvent *) event {NSTimer * timer = [NSTimer timerWithTimeInterval: 3 target: self selector: @ selector (test) userInfo: nil repeats: YES]; // Add it to the default runloop [[nsunloop currentRunLoop] addTimer: timer forMode: UITrackingRunLoopMode]; [timer fire];}-(void) test {NSLog (@ "xubao loves fish");} @ end

Let's add nstdes to the nsunloopcommonmodes mode.

 

We can clearly see that nstimer is executed when we scroll or do not scroll TextView.

/// ViewController. m // CX RunLoop analysis // Created by ma c on 16/3/29. // Copyright©2016 xubaoaichiyu. all rights reserved. // # import "ViewController. h "@ interface ViewController () @ end @ implementation ViewController-(void) viewDidLoad {[super viewDidLoad];}-(void) touchesBegan :( NSSet <UITouch *> *) touches withEvent :( UIEvent *) event {NSTimer * timer = [NSTimer timerWithTimeInterval: 3 target: self selector: @ selector (test) userInfo: nil repeats: YES]; // Add it to the default runloop [[nsunloop currentRunLoop] addTimer: timer forMode: nsunloopcommonmodes]; [timer fire];}-(void) test {NSLog (@ "xubao loves fish");} @ end

NSTimer * timer = [NSTimer scheduledTimerWithTimeInterval: 2 target: self selector: @ selector (test) userInfo: nil repeats: YES];

Automatically added to runloop and the default value is NSDefaultRunLoopMode.

However, we can change the mode in the same way as above.

/// ViewController. m // CX RunLoop analysis // Created by ma c on 16/3/29. // Copyright©2016 xubaoaichiyu. all rights reserved. // # import "ViewController. h "@ interface ViewController () @ end @ implementation ViewController-(void) viewDidLoad {[super viewDidLoad];}-(void) touchesBegan :( NSSet <UITouch *> *) touches withEvent :( UIEvent *) event {NSTimer * timer = [NSTimer scheduledTimerWithTimeInterval: 2 target: self selector: @ selector (test) userInfo: nil repeats: YES];}-(void) test {NSLog (@ "xubao loves fish");} @ end