Learn about nstimer

Nstimer

 

Create a timer

+ Scheduledtimerwithtimeinterval: Invocation: repeats:

+ (Nstimer *) scheduledtimerwithtimeinterval :( nstimeinterval) Ti invocation :( nsinvocation *) Invocation repeats :( bool) yesorno;

+ Scheduledtimerwithtimeinterval: Target: selector: userinfo: repeats:

+ (Nstimer *) scheduledtimerwithtimeinterval :( nstimeinterval) Ti target :( ID) atarget selector :( SEL) aselector userinfo :( ID) userinfo repeats :( bool) yesorno;

Create a new nstimer object and time table, and call an instance method cyclically in the current default mode.

+ Timerwithtimeinterval: Invocation: repeats:

+ (Nstimer *) timerwithtimeinterval :( nstimeinterval) Ti invocation :( nsinvocation *) Invocation repeats :( bool) yesorno;

+ Timerwithtimeinterval: Target: selector: userinfo: repeats:

+ (Nstimer *) timerwithtimeinterval :( nstimeinterval) Ti target :( ID) atarget selector :( SEL) aselector userinfo :( ID) userinfo repeats :( bool) yesorno;

-Initwithfiredate: interval: Target: selector: userinfo: repeats:

-(ID) initwithfiredate :( nsdate *) date interval :( nstimeinterval) Ti target :( ID) T selector :( SEL) s userinfo :( ID) UI repeats :( bool) rep;

Scheduledtimerwithtimeinterval :( nstimeinterval) seconds

Reserve a timer and set a time interval.

Indicates the input of a time interval object, in seconds, a value greater than 0 of the floating point type. If the value is <0, the default value is 0.1.

Target :( ID) atarget

Indicates the sent object, such as self.

Selector :( SEL) aselector

Method selector. During the interval, select to call an instance method.

Userinfo :( ID) userinfo

This parameter can be set to nil. When the timer fails, the specified object retains and releases the timer.

Repeats :( bool) yesorno

When yes, the timer continues until it becomes invalid or is released. When no, the timer will be sent cyclically once and then become invalid.

Invocation :( nsinvocation *) Invocation

Start Timer

-Fire

Stop Timer

-Invalidate

Timer settings

-Isvalid

-Firedate

-Setfiredate:

-Timeinterval

-Userinfo

Nstimeinterval class: A floating point number used to define the second

Example:

The iPhone provides us with a very long timer nstimer

He can complete any scheduled function:

It's easy to use. Just remember the three elements. The three elements are: Time Interval nstimeinterval floating point, event proxy

Delegate and event processing method @ selector ();

+ (Nstimer *) scheduledtimerwithtimeinterval :( nstimeinterval) Ti target :( ID) atarget selector :( SEL) aselector userinfo :( ID) userinfo repeats :( bool) yesorno;
To initialize a time timer.

The following is a simple example.

Initialize a Timer:

-(Void) inittimer

{

// Time Interval

Nstimeinterval timeinteger = 1.0;

// Timer

Nstimer showtimer = [nstimer scheduledtimerwithtimeinterval: maxshowtime

Target: Self

Selector: @ selector (handlemaxshowtimer :)

Userinfo: Nil

Repeats: No];

}

// Trigger the event

-(Void) handlemaxshowtimer :( nstimer *) thetimer

{

Nsdateformatter dateformator = [[nsdateformatter alloc] init];

Dateformator. dateformat = @ "yyyy-mm-dd hh: mm: SS ";

Nsstring * Date = [dateformater stringfromdate: [nsdate date];

If ([date isequaltostring: @ "23:59:59"])

{

Uialertview * Alert = [[uialertview alloc] initwithtitle: title_name

Message: @ "now it's a new day! "

Delegate: Self

Ancelbuttontitle: Nil

Otherbuttontitles: confirm_title, nil];

[Alert show];

[Alert release];

}

[Data release];

[Dateformator release];

}

Another example is provided: Box race

-(Void) viewdidload

{

 

[Super viewdidload];

Cgrect workingframe;

 

Workingframe. Origin. x = 15;

Worker frame. Origin. Y = 400;

Workingframe. Size. width = 40;

Workingframe. Size. Height = 40;

 

For (INT I = 0; I <6; I ++)

{

Uiview * myview = [[uiview alloc] initwithframe: workingframe];

[Myview settag: I]; // mark the square

[Myview setbackgroundcolor: [uicolor bluecolor];

 

Workingframe. Origin. x = workingframe. Origin. x + workingframe. Size. Width + 10;

[Self. View addsubview: myview];

}

}