数组排序的API分为2中，一种是数组直接调用API排序，另一种根据NSSortDescriptor来排序
//数组中的排序Api
- (NSArray *)sortedArrayUsingComparator:(NSComparator NS_NOESCAPE)cmptr API_AVAILABLE(macos(10.6), ios(4.0), watchos(2.0), tvos(9.0));
- (NSArray *)sortedArrayWithOptions:(NSSortOptions)opts usingComparator:(NSComparator NS_NOESCAPE)cmptr API_AVAILABLE(macos(10.6), ios(4.0), watchos(2.0), tvos(9.0));
//NSSortDescriptor中的排序Api
这个类里面有很多排序的API，毕竟看类就知道，这是专门排序的类文件
+ (instancetype)sortDescriptorWithKey:(nullableNSString *)key ascending:(BOOL)ascending API_AVAILABLE(macos(10.6), ios(4.0), watchos(2.0), tvos(9.0));
- (instancetype)sortDescriptorWithKey:(nullableNSString *)key ascending:(BOOL)ascending selector:(nullableSEL)selector API_AVAILABLE(macos(10.6), ios(4.0), watchos(2.0), tvos(9.0));
-
(void)viewDidLoad {
[super viewDidLoad];
NSMutableArray *dataArr = [NSMutableArray array];
Person*person1 = [Personnew];
person1.name=@"shanghai";
person1.age=@"30";
person1.height=1.88;
[dataArraddObject:person1];
Person*person2 = [Personnew];
person2.name=@"shenzhen";
person2.age=@"26";
person2.height=1.79;
[dataArraddObject:person2];
Person*person3 = [Personnew];
person3.name=@"hangzhou";
person3.age=@"22";
person3.height=1.74;
[dataArraddObject:person3];
/* ascending为YES是升序，反之为降序 , */
//升序
//推荐 “descriptorWithKey:ascending:”明显简单多了
NSArray *sortArr1 = [self sortByDataArr1:dataArr descriptorWithKey:@"height" ascending:YES];
NSArray*sortArr2 = [selfsortByDataArr2:dataArrascending:YES];
//降序
NSArray *sortArr3 = [self sortByDataArr1:dataArr descriptorWithKey:@"height" ascending:NO];
NSArray*sortArr4 = [selfsortByDataArr2:dataArrascending:NO];
NSLog(@"234");
}
/**
根据关键字排序，返回一个排序好的数组
@param dataArr 需要排序的数组
@param sortKey 排序关键字
@param ascending 降序 or 升序
@return 返回一个排序好的数组
*/
-(NSArray)sortByDataArr1:(NSArray)dataArr descriptorWithKey:(NSString*)sortKey ascending:(BOOL)ascending{
NSSortDescriptor *sortDescriptor1 = [NSSortDescriptor sortDescriptorWithKey:sortKey ascending:ascending];
NSArray*sortArr = [dataArrsortedArrayUsingDescriptors:@[sortDescriptor1]];
returnsortArr;
}
/**
根据你想要“升序还是降序”，返回一个排序好的数组
@param dataArr 需要排序的数组
@param ascending 升序还是降序
@return 返回一个排序好的数组
*/
-(NSArray)sortByDataArr2:(NSArray)dataArr ascending:(BOOL)ascending{
NSArray*sortArr = [dataArr sortedArrayUsingComparator:^NSComparisonResult(Person * obj1, Person * obj2) {
if(ascending) {
if(obj1.height== obj2.height) {
[obj1.namecompare:obj2.name];
}
if(obj1.height> obj2.height) {
return NSOrderedDescending;
}else{
return NSOrderedAscending;
}
}else{
if(obj1.height> obj2.height) {
return NSOrderedAscending;
}else{
return NSOrderedDescending;
}
returnNSOrderedSame;
}
}];
returnsortArr;
}