NSMutableArray 排序

NSMutableArray* arr = [NSMutableArrayarrayWithObjects:
[NSNumber numberWithInt:0],
[NSNumber numberWithInt:3],
[NSNumber numberWithInt:2],
[NSNumber numberWithInt:1],
[NSNumber numberWithInt:7],
[NSNumber numberWithInt:8],
[NSNumber numberWithInt:9],
[NSNumber numberWithInt:10],
[NSNumber numberWithInt:6],
[NSNumber numberWithInt:5],
[NSNumber numberWithInt:4],
nil];

// 升序
// 0 --> 10
[arr sortUsingComparator:^NSComparisonResult(__strongid obj1,__strong id obj2){
return [obj1 intValue] > [obj2intValue];
}];

NSLog(@"%@", [arrdebugDescription]);

// 降序
// 10 --> 0
[arr sortUsingComparator:^NSComparisonResult(__strongid obj1,__strong id obj2){
return [obj1 intValue] < [obj2intValue];
}];
NSLog(@"%@", [arrdebugDescription]);

NSMutableArray* arr = [NSMutableArray arrayWithObjects:@"C", @"A", @"H", @"I", @"B", @"D", @"J", @"E", @"F", @"G", @"K", nil];

// 升序
// A --> K
[arr sortUsingComparator:^NSComparisonResult(__strong id obj1,__strong id obj2){
NSString *str1=(NSString *)obj1;
NSString *str2=(NSString *)obj2;
return [str1 compare:str2];
}];

NSLog(@"%@", [arr debugDescription]);

// 降序
// K --> A
[arr sortUsingComparator:^NSComparisonResult(__strong id obj1,__strong id obj2){
NSString *str1=(NSString *)obj1;
NSString *str2=(NSString *)obj2;
return [str2 compare:str1];
}];
NSLog(@"%@", [arr debugDescription]);