?1.使用NSSortDescriptor對(duì)象進(jìn)行數(shù)組排序
//創(chuàng)建一個(gè)數(shù)組
NSArray *array = @[@"one", @"two", @"three", @"four", @"six"];
//創(chuàng)建一個(gè)排序條件，也就是一個(gè)NSSortDescriptor對(duì)象
//其中第一個(gè)參數(shù)為數(shù)組中對(duì)象要按照什么屬性來排序(比如自身、姓名，年齡等)
//第二個(gè)參數(shù)為指定排序方式是升序還是降序
//ascending? 排序的意思，默認(rèn)為YES 升序
NSSortDescriptor *des = [[NSSortDescriptor alloc] initWithKey:@"self" ascending:YES];
NSArray *newArray = [array sortedArrayUsingDescriptors:@[des]];
NSLog(@"%@",newArray);
2.使用sortedArrayUsingDescriptors:方法實(shí)現(xiàn)把多個(gè)排序條件放到數(shù)組中，實(shí)現(xiàn)多條件排序，按數(shù)組先后順序，先加入的優(yōu)先級(jí)高
//創(chuàng)建一個(gè)Person類
Person *p1 = [[Person alloc] initWithName:@"zhonger" age:@"19"];
Person *p2 = [[Person alloc] initWithName:@"zhubada" age:@"11"];
Person *p3 = [[Person alloc] initWithName:@"zhubada" age:@"1"];
Person *p4 = [[Person alloc] initWithName:@"zhubada" age:@"33"];
Person *p5 = [[Person alloc] initWithName:@"hehehe" age:@"38"];
NSArray *person = @[p1, p2, p3, p4, p5];
NSSortDescriptor *des1 = [[NSSortDescriptor alloc]initWithKey:@"name" ascending:YES];
NSSortDescriptor *des2 = [[NSSortDescriptor alloc] initWithKey:@"age" ascending:NO];
NSArray *newArray1 = [person sortedArrayUsingDescriptors:@[des1,des2]];
NSLog(@"%@",newArray1);
3.使用sortedArrayUsingComparator進(jìn)行數(shù)組排序
Comparator的返回結(jié)構(gòu)枚舉類型含義：
NSOrderedAscending//升序
The left operand is smaller than the right operand.
NSOrderedSame
The two operands are equal.
NSOrderedDescending//降序
The left operand is greater than the right operand.
直接使用代碼塊對(duì)字典里具體屬性進(jìn)行排序
NSString *arr = [arr sortedArrayUsingComparator:^NSComparisonResult(id _Nonnull obj1, id _Nonnull obj2) {
NSString *age1 = [obj1 objectForKey:@"age"];
NSString *age2 = [obj2 objectForKey:@"age"];
//轉(zhuǎn)換成NSNumber便于直接使用compare：方法直接排序
NSNumber *num1 = [NSNumber numberWithInteger:age1];
NSNumber *num2 = [NSNumber numberWithInteger:age2];
//升序
NSComparisonResult result = [num1 compare:num2];
return result;
}];
NSLog(@"%@",arr);
//其中compare：內(nèi)部實(shí)現(xiàn)類似于下(也可自定義對(duì)象的比較方法)
NSComparator cmp = ^(id obj1, id obj2) {
if ([obj1 integerValue] < [obj2 integerValue]) {
? ? ? return (NSComparisonResult)NSOrderedAscending;? ?? ? ?
}else if ([obj1 integerValue] > [obj2 integerValue]) {
? ? ? return (NSComparisonResult)NSOrderedDescending;?
}else {
? ? ? return (NSComparisonResult)NSOrderedSame;
};
