不可变数组或者可变数组进行排序

#import <Foundation/Foundation.h>

NSInteger myCompare(id obj1,id
obj2,void *context)

{

//不分大小写进行升序排序

//return [obj1 caseInsensitiveCompare:obj2];

return -[obj1
caseInsensitiveCompare:obj2];

}

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

{

@autoreleasepool {

NSArray
*array=@[@"one", @"Two",
@"Three", @"Four"];

NSMutableArray
*mutableArray=[NSMutableArrayarrayWithArray:array];

//1不可变数组通过自定义比较规则来比较字符串

NSArray *result= [array
sortedArrayUsingFunction:myComparecontext:nil];

NSLog(@"%@\n",result);

//类提供compare方法不想改变数组顺序

[array
sortedArrayUsingSelector:@selector(compare:)];

NSLog(@"%@\n",array);

//2直接在数组内排序

[mutableArray
sortUsingFunction:myCompare
context:nil];

NSLog(@"%@\n",mutableArray);

}

return 0;

}

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