Block array sorting

//

Main.m

Block jobs

//

Created by lanou3g on 14-11-20.

Copyright (c) 2014 Lanou_zhou. All rights reserved.

//

#import <Foundation/Foundation.h>

int main (int argc, const char * argv[])

{

Definition? A block with a return value of bool, with two nsstring parameters. Implementation: Sentencing

The broken strings are equal.

BOOL (^comparestring) (NSString *, nsstring *) = ^ (NSString *str1, NSString *str2) {

if ([str1 isequaltostring:str2]) {

return YES;

}else{

return NO;

}

};

if (CompareString (@ "SSS", @ "SSS")) {

NSLog (@ "Same");

}

Definition? A block, the return value is Nsinteger, there are two parameters,? One is Nsarray, one is nsstring. Implementation: The array is judged to contain this string, if included, returns the subscript of the string, if not included, returns-1.

Nsarray *arr = @[@ "AA", @ "ss", @ "WW"];

NSString *str = @ "ss";

Int (^find) (Nsarray *, nsstring *) = ^ (Nsarray *arr, NSString *str) {

for (int i = 0; i < Arr.count; i++) {

if ([Arr[i] isequaltostring:str]) {

return i;

}

}

return-1;

};

int f = Find (ARR,STR);

NSLog (@ "%d", f);

Create an array that is initialized to @ "123", @ "21", @ "33", @ "69", @ "108",

@ "256". To use the block syntax, to sort the array of rows in. and output the content. Sorted results: 108 123 21 256 33 69

Reference: Sortedarraywithoptions:usingcomparator:

Non-variable groups

Nsarray *arr1 = @[@ "23", @ "1", @ "3", @ "2", @ "108"];

Nsarray *ARR2 = [arr1 sortedarrayusingcomparator:^nscomparisonresult (ID obj1, id obj2) {

if ([Obj1 intvalue] > [obj2 intvalue]) {

return nsordereddescending;

}

return nsorderedsame;

}

];

NSLog (@ "sortarray1:%@", arr2);

Nsarray *arr11 = @[@ "23", @ "1", @ "3", @ "2", @ "108"];

Nsarray *a1 = [Arr11 sortedarrayusingcomparator:^nscomparisonresult (ID obj1, id obj2) {

if ([Obj1 intvalue] > [obj2 intvalue]) {

return nsordereddescending;

}

return nsorderedsame;

}

];

NSLog (@ "sortarray1:%@", A1);

5, block for variable array sorting

5,1

Nscomparator Sortblock = ^ (ID string1, id string2)

{

return [string1 compare:string2];

};

Nsmutablearray *stringarray = [Nsmutablearray arraywithobjects:@ "G", @ "C", @ "B", @ "a", nil];

Nsarray *a = [Stringarray sortedarrayusingcomparator:sortblock];

NSLog (@ "array:%@", a);

Block immutable groups written separately

Nscomparator SortBlock1 = ^ (ID string1, id string2)

{

return [string1 compare:string2];

};

Nsarray *stringarray2 = [Nsarray arraywithobjects:@ "G", @ "C", @ "B", @ "a", nil];

Nsarray *a2 = [StringArray2 sortedarrayusingcomparator:sortblock1];

NSLog (@ "block variable array written separately:%@", A2);

return 0;

}

Block array sorting