Dark Horse Programmer--OC Learning Summary--founation Framework

------Java Training, Android training, iOS training,. NET training, look forward to communicating with you! -------

1. Commonly used structural bodiesThe Nsrange nspoint nsrect nssize is defined in the Founation framework and they are often created like this: #import <founation/founation.h>void main () {@ Autoreleasepool{//range use Nsrange rang=nsmakerange (10,34);//Specify a starting and ending range//cgrang rang=cgpiontmake (10,34);// Cgrange can also be used to define nstring *str=stringformrange (rang);//String Print NSLog (@ "rang=%@", str); The use of rect contains x y width height nsrect rect=nsmakerect (2,3,45,32);  CGRect Rect=cgrectmake (2,3,45,32) nsstring *str2=stringformrect (rect); }  } Use of 2.NSStringThe NSString immutable string is an OC object that needs to free memory, and the static method call does not have to be freed #import <Founation/Founation.h> void Main () {@autoreleasepool { NSString *string=[[nsstring Alloc] init]//Create a nsstring[email protected] "fff"; [String release]; NSString *str=[[nsstring initwithformat:@ "His was%i", 24];//string formatted output [str release];//static method call NSString *str1=[nsstring stringwithstring:@ "FFFFF"]; NSString *str2=[nsstring stringwithformat:@ "Fffff%i", 34]; NSLog (@ "%@%@", STR,STR2); }  } Use of 3.NSMutableStringis a mutable string that also needs to manage memory #import <Founation/Founation.h> void Main () {@autoreleasepool {[nsmutablestring * str=[[  Nsmutablestring Alloc] initwithcapacity:10]//pre-allocated 10 words storage space for increased efficiency [str setstring:@ "SS"];  [Str appendstring:@ "FFF"];//splicing string [str appendformat:@ "FFFF age was%i and Heighe is%2f", 23,1,72];//formatted output [str release]; } 4.NSArray Non-variable group#import <Founation/Founation.h> void Main () {@autoreleasepool {nsarray *arr=[nsarray arraywithobjects:@ "JH", @ " WK ", @" 4 ", @" 5 ", nil];//definition array [arr objectatindex:2];//remove the third element [arr indexofobject:@" wk "];//remove the corner mark [Arr lastobject];// Remove the last element [arr count];//extract element number//traverse int i=0;for (ID ob in arr) {NSLog ("%i\t%@", i,obj); i++;//sort Nsarray *array=[nsarray arraywithobjects:@ "", @ "4", @ "2", Nil]nsarray *arr2=[array Sortedarrayusingseletcor: @seletcor (compare:)];//    Sort well to return a new array NSLog (@ "%@", arr2); }    } 5.NSMutableArray variable Array#import <Founation/Founation.h> void Main () {@autoreleasepool {nsmutablearray arr=[nsmutablearray array]; [Arr addobject:@ "FF"];//add content [arr removeobject:@ "ff"]//delete content Student *s=[[student alloc] init]; [Arr addobject:s]; Retain once [arr removeobject:s]//release once [s release]; [ARR release]//When the array is released, it will do a release operation for all elements once//sort Nsmutablearray arr=[nsarray arraywithobjects:@ "4" @ "3" @ "5" @ "2", nil ][arr Sortusingseletcor: @seletcor (compare:)];//sort well returns itself NSLog (@ "%@", array);} 6.NSDictionary Immutable Dictionary#import <Founation/Founation.h> void Main () {@autoreleasepool {nsdictionary *dict=[nsdictionary  dictionarywithobjectsandkeys:@ "v1", @ "V2", @ "V3", @ "K1", @ "K2", @ "K3", nil]; ID v_= [dict objectforkey:@ "K2"];//dictionary value can only be changed [Dict count];//dictionary all elements [dict allvalues];//dictionary All values can only be changed [Dict allkeys];/  /dictionary all key//traversal for (ID key in dict) {ID value=[dict objectforkey:key];   NSLog (@ "%@--%@", Key,value); }    }   7.NSMutableDictionary Non-variable group#import <Founation/Founation.h> void Main () {@autoreleasepool {nsmutabledictionary *dit=[nsmutabledictionary  Dictionary]; [Dict setobject:@ "v2" forkey:@ "K2"];//add element [dict removeallobjects];//Delete all key value pairs [dict [email protected] "K2"]// Delete the value//Dictionary of the Key object when destroyed will release each element once}   Use of 9.NSNumber#import <Founation/Founation.h> void Main () {@autoreleasepool {nsnumber *n=[nsnumber numberwithint:100];//  Wrap int Type 10 as NSNumber object Nsarray *arr=[nsarray Arraywithobject:num];  ID Num=[arr lastobject];//out of the array int n1=[num intvalue];//converted to int type NSLog (@ "n1=%i", N1); The result of the operation is: n1=100 Use of NSDate#import <Founation/Founation.h> void Main () {@autoreleasepool {nsdate *date=[nsdate date];//creation Date Date=[nsdate DATEWITHTIMEINTERVALSINCENOW:20]; Returns a time that is 20 seconds faster than now [date distantfuture];//automatically returns a future distant time [date distantpast];//randomly returns a time in the past NSDateFormatter *format=[[ns Dateformatter alloc] init]; [Email protected] "YYYY-MM-DD HH:mm:ss";//Format datetime nsstring *str=[format stringfromdate:date];//date format converted to string NSDate date1  =[format datefromstring:@ "2008-08-08 07:34:43"];//character format converted to date format NSLog (@ "str=%@", SRT);   NSLog (@ "date=%@". Date1);   [Format release]; The result of the operation:

Dark Horse Programmer--OC Learning Summary--founation Framework