NSARRY排序

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NSMutableArray *array = [[NSMutableArray alloc] init];

[array addObject:[NSNumber numberWithInt:1]];

[array addObject:[NSNumber numberWithInt:3]];

[array addObject:[NSNumber numberWithInt:2]];

NSArray *sorteArray = [array sortedArrayUsingComparator:^(id obj1, id obj2){

if ([obj1 integerValue] > [obj2 integerValue]) {

return (NSComparisonResult)NSOrderedDescending;

}

if ([obj1 integerValue] < [obj2 integerValue]) {

return (NSComparisonResult)NSOrderedAscending;

}

return (NSComparisonResult)NSOrderedSame;

}];

NSLog(@"%@",sorteArray); //从小到大

NSArray *array2 = [array sortedArrayUsingComparator:^(id obj1, id obj2){

if ([obj1 integerValue] > [obj2 integerValue]) {

return (NSComparisonResult)NSOrderedAscending;

}

if ([obj1 integerValue] < [obj2 integerValue]) {

return (NSComparisonResult)NSOrderedDescending;

}

return (NSComparisonResult)NSOrderedSame;

}];

NSLog(@"%@",array2);

// ascending: YES 为升序 NO 为降序

NSSortDescriptor *sd1 = [NSSortDescriptor sortDescriptorWithKey:@"self" ascending:YES];

NSArray *arr1 = [array sortedArrayUsingDescriptors:[NSArray arrayWithObjects:sd1, nil]];

NSLog(@"%@",arr1);

NSArray* tmp = [[self.dictdata allKeys] sortedArrayUsingSelector:@selector(compare:)];