Dark Horse programmer-oc language learning experience-block

Dark Horse Programmer-oc Language learning experience-block

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1, the program typically uses typedef to define a block type and then call

typedef void(^XXX) ();

can use mnemonic inlineblock

2,block internal access to external variables;
By default, external local variables cannot be modified inside the block

To add the __block keyword to the local variable, the local variable can be modified inside the block.

The role of 3,block:

Block encapsulation code can be used as function return values and function parameters.

Increased code flexibility and efficiency

Here are the code implementations that you write yourself

#import<Foundation/Foundation.h>//void (^workblock) () block seat function parameter transfertypedefvoid(^Newbolck) ();voidWorkintN) {NSLog (@"get up .... "); NSLog (@"brush your teeth .... "); NSLog (@"wash your face .... "); NSLog (@"go to the company .... "); //Workblock (); //not the same here .Newbolck WorkDay (inta);//declares a method, because the method body is belowNewbolck W=workday (n);//the return value for Workday (n) Here is Newblock objectW ();//Execute code blockNSLog (@"go home .... ");} typedefvoid(^NewType) ();//The return value is block typeNewType Test () {NewType N1=^{NSLog (@"xxxxxxx"); NSLog (@"yyyyyyyy");    }; returnN1;}//A block with two parameters to do the return valuetypedefint(^newtype2) (int,int); newType2 test2 () {return^(intAintb) {            returnA +b; };}//let him return a value of block typeNewbolck WorkDay (inta) {        //Simplify//typedef void (^block) ();//Defining aliasesNewbolck W;//define BOLCK type variable without adding * number .....        Switch(a) { Case 1: w=^() {NSLog (@"Understanding the Project");        };  Case 2: w=^() {NSLog (@"development Projects");        };  Case 3: w=^() {NSLog (@"sold the project");            };  Break; default:             Break; }       //Work (w);    returnW;}intMainintargcConst Char*argv[]) {@autoreleasepool {//for (int i=1; i<=5; i++) {Work (1); // }                        //call return value to block type method//because the test () method returns a value that is a block object, the object is created to acceptNewType n2=test ();                N2 (); NewType2 N3=test2 (); intRESULT=N3 (3,8); NSLog (@"result=%d", result); WorkDay (1); printf ("\ n"); WorkDay (2); printf ("\ n"); WorkDay (3); printf ("\ n"); void(^myblock) (int,int)=^(intAintb) {NSLog (@"a+b=%d", A +b);         }; Myblock (2,8); typedefint(^NEWBOLCK) (int,int); Newbolck B1=^(intXinty) {returnx+y;                }; Newbolck B2=^(intXinty) {                            returnX>y?x:y;                               }; NSLog (@"b1->%d", B1 (2,5)); NSLog (@"b2->%d", B2 (5,9)); }                return 0; }

Dark Horse programmer-oc language learning experience-block