ios--Common class--nsarray

First, from small to large sort

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1. Note the different methods used for variable arrays and non-variable groups (in fact, go directly to Nsarray and nsmutablearray the respective API to find)

Nsarray *myarray=[nsarray arraywithobjects:@ "5", @ "6", @ "1", @ "2", @ "3", @ "4", nil];

Nsmutablearray *mymutablearray=[nsmutablearray arraywithobjects:@ "5", @ "6", @ "1", @ "2", @ "3", @ "4", nil];

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

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

return nsordereddescending;

}

else if ([Obj1 intvalue]<[obj2 intvalue])

{

return nsorderedascending;

}

Else

return nsorderedsame;

}];

NSLog (@ "last:%@", last);

[Mymutablearray sortusingcomparator:^nscomparisonresult (ID obj1, id obj2) {

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

return nsordereddescending;

}

else if ([Obj1 intvalue]<[obj2 intvalue])

{

return nsorderedascending;

}

Else

return nsorderedsame;

}];

NSLog (@ "mymutable:%@", Mymutablearray);

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2. Can be sorted by multiple keywords

Nsdictionary *dic1=[nsdictionary dictionarywithobjectsandkeys:@ "2", @ "id", @ "one", @ "age", nil];

Nsdictionary *dic2=[nsdictionary dictionarywithobjectsandkeys:@ "1", @ "id", @ "@", @ "age", nil];

Nsdictionary *dic3=[nsdictionary dictionarywithobjectsandkeys:@ "3", @ "id", @ "a", @ "age", nil];

Nsarray *array=[nsarray arraywithobjects:dic1,dic2,dic3, nil];

First by ID, then by age (ascending: Whether it is a larger order)

Nssortdescriptor *descriptor1=[nssortdescriptor sortdescriptorwithkey:@ "id" ascending:yes];

Nssortdescriptor *descriptor2=[nssortdescriptor sortdescriptorwithkey:@ "age" ascending:yes];

Nsarray *descriptorarray=[nsarray Arraywithobjects:descriptor1,descriptor2, nil];

Nsarray *lastarray=[nsarray Arraywitharray:[array Sortedarrayusingdescriptors:descriptorarray];

NSLog (@ "lastarray:%@", Lastarray);

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ios--Common class--nsarray