Embedded &ios: callback function (C) vs. block (OC) parameter/function comparison

C's callback function:

CallBack.h

1), declare a dosomethingcount function, the parameter is a (no return value, 1 int parameter) function.

void Dstcount (void (*callback) (int data_i32));

Callback.c

1), in the Dosomethingcount function, increment the number of runs, and call the parameter--function.

void Dstcount (void (*callback) (int data_i32)) {    static int numb = 0;    numb++;    (*callback) (numb);}

　

Main.c

1), define a customdosomethingcount function, print the data.

void Customdstcount (int data_i32) {    printf ("%d\n", DATA_I32);}

2), main function, run CallBack.h's Dstcount function, the parameter is the Customdstcount function in main.

while (1) {    dstcount (customdstcount);}

Block of OC:

MyButton.h (inherited from UIButton):

1), define a block of the number of parameters, type.

typedef void (^buttonblock) (int data_i32);

2), declare a dosomethingcount function with the block parameter. (Note that there is no need to add *, class with the habit, parameters readily add a *)

-(void) Dstcount: (Buttonblock) mybuttonblockptr;

MYBUTTON.M (inherited from UIButton):

1), in the Dosomethingcount function, increment the number of runs, and call the block parameter.

-(void) Dstcount: (buttonblock) mybuttonblockptr{    static int numb = 0;    numb++;    Mybuttonblockptr (numb);}

　

ROOTVIEWCONTROL.M (Self.window.rootViewController):

1), Viewdidload function, define a (100,100,100,100), red button instance, button to add the event, the button is added to the Self.view.

MyButton *tempbutton = [[MyButton alloc]initwithframe:cgrectmake (+, +, +)];    Tempbutton.backgroundcolor = [Uicolor redcolor];    [Tempbutton addtarget:self Action: @selector (Mybuttonclick:) forcontrolevents:uicontroleventtouchupinside];    [Self.view Addsubview:tempbutton];

2), button click Call, Call MyButton in the Dstcount function, block parameters directly input.

-(void) Mybuttonclick: (mybutton*) button{    [button dstcount:^ (int data_i32) {        printf ("%d\n", data_i32);    }];}

Photo Supplement:

C callback function:

1), CALLBACK.C

2), CallBack.h

3), MAIN.C

Block of OC

1), MyButton.h

2), MYBUTTON.M

3), ROOTVIEWCONTROL.M

4), run

Embedded &ios: callback function (C) vs. block (OC) parameter/function comparison