Object-c's Timer

Main code:

1 set a timer first2 timeinterval: Set time interval3 target: Represents the Sent object4 selector: Select an instance method5 userInfo: This parameter can be nil, and when the timer fails, the timer is reserved and freed by the object you specify6 7[Nstimer Scheduledtimerwithtimeinterval:2.0ftarget:self selector: @selector (dotimer:) userinfo:handle Repeats:yes];8 9 Ten- (void) Dotimer: (Nstimer *) Timer One { A ... - //Timer Failure - [timer invalidate]; the  - } -  -  +  - Main function +  A [Timer startwrite]; at //When added to Runloop, the timer is automatically triggered after the timeinterval seconds specified at initialization.  -[[Nsrunloop Currentrunloop]run];

Full code:

1 main.m2 3         4Timers *timer =[[Timers Alloc]init];5         6 [Timer startwrite];7         8 [[Nsrunloop Currentrunloop]run];9 Ten Timer.h One #import<Foundation/Foundation.h> A  - @interfaceTimers:nsobject -  the@property (nonatomic,retain) Nstimer *timer; -  -- (void) Startwrite; -  + @end -  +  A #import "Timers.h" at  - @implementationTimers -  - Static intnum =0; -  -  in- (void) Dotimer: (Nstimer *) Timer - { to     //dealing with problems +num++; -Nsfilehandle *handle =[Timer userInfo]; theNSDate *date =[NSDate Date]; *     //Set Date format $NSDateFormatter *formatter =[[NSDateFormatter alloc]init];Panax Notoginseng[Formatter Setamsymbol:@"Morning"]; -[Formatter Setpmsymbol:@"Afternoon"]; the[Formatter Setdateformat:@"yyyy mm month DD Day HH:MM:SS EEE AAA"]; +      A     //date Formatting theNSString *time =[Formatter stringfromdate:date]; +     //Add line break -NSString *time1 = [Time stringbyappendingstring:@"\ n"]; $      $NSData *data =[time1 datausingencoding:nsutf8stringencoding]; -     //move cursor to end of file - [handle seektoendoffile]; the     //Write Data - [handle writedata:data];Wuyi      the     if(num>=5) -     { Wu [timer invalidate]; -NSLog (@"ha ha haha"); About         //[handle closefile]; $     } - } -  -- (void) Startwrite A { +     //Data Store Path theNSString *path =@"/users/scjy/desktop/Liu Jirong Practice/oc/Exercise 1/Date Write/date write/dateinsert.txt"; -      $Nsfilemanager *filemanger =[Nsfilemanager Defaultmanager]; the     if(![Filemanger Fileexistsatpath:path]) the     { the         //If the file does not exist, create the file the [Filemanger createfileatpath:path contents:nil Attributes:nil]; -          in     } the      the     //Prepare to write AboutNsfilehandle *handle =[Nsfilehandle Filehandleforwritingatpath:path]; the      the[Nstimer Scheduledtimerwithtimeinterval:2.0ftarget:self selector: @selector (dotimer:) userinfo:handle Repeats:yes]; the      + } - @end

Object-c's Timer