Block and method sort the names of each country

• When the block needs to be used as a parameter to the method.

  • When implementing functionality within the method. If you are implementing a sub-function, if you are not sure how it is implemented.
  • Only callers are clear. Then let the caller write 1 code to implement this function to pass this code through the block parameter in.

• Block can be used as the return value of a function or method

• . The similarities and differences between block and function

  • . The same point: you can encapsulate 1 pieces of code in it.

  • . Different points:

    • . Block is a 1 data type. And a function is a function.

    • . The block can be passed as a function parameter. The function cannot be passed directly as a parameter.

    • . Blocks can be nested. Functions cannot be nested defined.

ZYArray.h

#import <Foundation/Foundation.h>typedefBOOL (^SortArray)(char *countries1,char *countries2);@interface ZYArray : NSObject- (void)sortWithArray:(char *[])array andLength:(int)length andBlcok:(SortArray)sortArray;@end

Zyarray.m

#import"ZYArray.h"@implementation zyarray-(void) Sortwitharray: (Char*[])ArrayAndlength: (int) Length Andblcok: (Sortarray) sortarray{ for(inti =0; I<length-1; i++) { for(intj =0; J<length-i-1; J + +) {BOOL res = Sortarray (Array[j],Array[j+1]);if(Res >0)            {Char*temp =Array[j];Array[j] =Array[j+1];Array[j+1] = temp; }        }    } for(inti =0; I<length; i++) {NSLog (@'%s ',Array[i]); }}@End

Main.m

#import <Foundation/Foundation.h> #import "ZYArray.h" intMainintargcConst Char* argv[]) {Char*countries[] = {"Nepal","Cambodia","Afghanistan","China","Singapore","Bangladesh","India","Maldives","South Korea","Bhutan","Japan","Sikkim","Sri Lanka","Burma","North Korea","Laos","Malaysia","Indonesia","Turkey","Mongolia","Pakistan","Philippines","Vietnam","Palestine"};intLength =sizeof(countries)/sizeof(countries[0]);    Zyarray *array = [[Zyarray alloc]init]; [Array sortwitharray:countries andlength:length andblcok:^BOOL(Char*countries1,Char*countries2) {returnstrcmp (Countries1, countries2); }];return 0;}

This is sorted alphabetically and of course it can be sorted in other ways. See what you need

Copyright NOTICE: This article for Bo Master original article, without Bo Master permission not reproduced.

Block and method sort the names of each country