1.sortedArrayUsingSelector
（按Key值大小对NSDictionary排序）
1 NSMutableArray *array = [NSMutableArray arrayWithObjects: 2 [NSDictionary dictionaryWithObjectsAndKeys:@"Obj0", [NSNumber numberWithInt:0], nil], 3 [NSDictionary dictionaryWithObjectsAndKeys:@"Obj5", [NSNumber numberWithInt:5], nil], 4 [NSDictionary dictionaryWithObjectsAndKeys:@"Obj2", [NSNumber numberWithInt:2], nil], 5 [NSDictionary dictionaryWithObjectsAndKeys:@"Obj3", [NSNumber numberWithInt:3], nil], 6 [NSDictionary dictionaryWithObjectsAndKeys:@"Obj1", [NSNumber numberWithInt:1], nil], 7 [NSDictionary dictionaryWithObjectsAndKeys:@"Obj4", [NSNumber numberWithInt:4], nil], nil]; 8 9 NSArray *resultArray = [array sortedArrayUsingSelector:@selector(compare:)];
因为NSDictionary没有compare的排序比较方法，所以需要我们自己写
1 .h 2 @interface NSDictionary (compare) 3 {} 4 5 -(NSComparisonResult)compare:(NSDictionary *)otherDictionary; 6 7 @end 8 9 .m 10 @implementation NSDictionary (compare) 11 12 - (NSComparisonResult)compare: (NSDictionary *)otherDictionary 13 { 14 NSDictionary *tempDictionary = (NSDictionary *)self; 15 16 NSNumber *number1 = [[tempDictionary allKeys] objectAtIndex:0]; 17 NSNumber *number2 = [[otherDictionary allKeys] objectAtIndex:0]; 18 19 NSComparisonResult result = [number1 compare:number2]; 20 21 return result == NSOrderedDescending; // 升序 22 // return result == NSOrderedAscending; // 降序 23 } 24 25 @end
2.sortedArrayUsingComparator
1 NSMutableArray *array = [NSMutableArray arrayWithObjects: 2 [NSDictionary dictionaryWithObjectsAndKeys:@"Obj0", [NSNumber numberWithInt:0], nil], 3 [NSDictionary dictionaryWithObjectsAndKeys:@"Obj5", [NSNumber numberWithInt:5], nil], 4 [NSDictionary dictionaryWithObjectsAndKeys:@"Obj2", [NSNumber numberWithInt:2], nil], 5 [NSDictionary dictionaryWithObjectsAndKeys:@"Obj3", [NSNumber numberWithInt:3], nil], 6 [NSDictionary dictionaryWithObjectsAndKeys:@"Obj1", [NSNumber numberWithInt:1], nil], 7 [NSDictionary dictionaryWithObjectsAndKeys:@"Obj4", [NSNumber numberWithInt:4], nil], nil]; 8 9 // NSArray *resultArray = [array sortedArrayUsingSelector:@selector(compare:)]; 10 11 NSArray *resultArray = [array sortedArrayUsingComparator:^NSComparisonResult(id obj1, id obj2) { 12 13 NSNumber *number1 = [[obj1 allKeys] objectAtIndex:0]; 14 NSNumber *number2 = [[obj2 allKeys] objectAtIndex:0]; 15 16 NSComparisonResult result = [number1 compare:number2]; 17 18 return result == NSOrderedDescending; // 升序 19 // return result == NSOrderedAscending; // 降序 20 }];
3.sortedArrayUsingDescriptors & sortUsingDescriptors
前者带返回值，是NSArray的方法，排好序的数组是返回值中的数组；
后者不带返回值，是NSMutableArray的方法，是对当前数组自己排序
1 .h 2 @interface Person : NSObject 3 { 4 NSString *_name; 5 6 NSInteger _age; 7 } 8 @property (nonatomic, retain) NSString *name; 9 @property (nonatomic, assign) NSInteger age; 10 @end 11 12 .m 13 @implementation Person 14 @synthesize name = _name; 15 @synthesize age = _age; 16 17 18 - (void)dealloc 19 { 20 [_name release]; 21 22 [super dealloc]; 23 } 24 25 @end
1 Person *person1 = [[Person alloc] init]; 2 [person1 setName:@"ABC"]; 3 [person1 setAge:24]; 4 5 Person *person2 = [[Person alloc] init]; 6 [person2 setName:@"ACB"]; 7 [person2 setAge:22]; 8 9 Person *person3 = [[Person alloc] init]; 10 [person3 setName:@"ABD"]; 11 [person3 setAge:33]; 12 13 NSMutableArray *array = [NSMutableArray arrayWithObjects:person1, person2, person3, nil]; 14 [person1 release]; 15 [person2 release]; 16 [person3 release]; 17 18 NSSortDescriptor *sortDescriptor = [NSSortDescriptor sortDescriptorWithKey:@"_age" ascending:YES]; 19 20 NSArray *tempArray = [array sortedArrayUsingDescriptors:[NSArray arrayWithObject:sortDescriptor]]; 21 22 for(NSInteger i = 0; i < [tempArray count]; i++) 23 { 24 NSLog(@"%@--------%d ", [[tempArray objectAtIndex:i] name], [[tempArray objectAtIndex:i] age]); 25 } 26 27 // [array sortUsingDescriptors:[NSArray arrayWithObject:sortDescriptor]]; 28 // 29 // for(NSInteger i = 0; i < [array count]; i++) 30 // { 31 // NSLog(@"%@--------%d ", [[array objectAtIndex:i] name], [[array objectAtIndex:i] age]); 32 // }
sortDescriptorWithKey:@"_age",以age作为标准来做比较。
1 Person *person1 = [[Person alloc] init]; 2 [person1 setName:@"ABCD"]; 3 [person1 setAge:24]; 4 5 Person *person2 = [[Person alloc] init]; 6 [person2 setName:@"ACBD"]; 7 [person2 setAge:22]; 8 9 Person *person3 = [[Person alloc] init]; 10 [person3 setName:@"ABDC"]; 11 [person3 setAge:33]; 12 13 Person *person4 = [[Person alloc] init]; 14 [person4 setName:@"ACDB"]; 15 [person4 setAge:22]; 16 17 NSMutableArray *array = [NSMutableArray arrayWithObjects:person1, person3, person4, person2, nil]; 18 [person1 release]; 19 [person2 release]; 20 [person3 release]; 21 [person4 release]; 22 23 NSSortDescriptor *sortDescriptor1 = [NSSortDescriptor sortDescriptorWithKey:@"_age" ascending:YES]; 24 NSSortDescriptor *sortDescriptor2 = [NSSortDescriptor sortDescriptorWithKey:@"_name" ascending:YES]; 25 26 NSArray *tempArray = [array sortedArrayUsingDescriptors:[NSArray arrayWithObjects:sortDescriptor1, sortDescriptor2, nil]]; 27 28 for(NSInteger i = 0; i < [tempArray count]; i++) 29 { 30 NSLog(@"%@--------%d ", [[tempArray objectAtIndex:i] name], [[tempArray objectAtIndex:i] age]); 31 } 32 33 // [array sortUsingDescriptors:[NSArray arrayWithObject:sortDescriptor]]; 34 // 35 // for(NSInteger i = 0; i < [array count]; i++) 36 // { 37 // NSLog(@"%@--------%d ", [[array objectAtIndex:i] name], [[array objectAtIndex:i] age]); 38 // }
NSSortDescriptor *sortDescriptor1 = [NSSortDescriptorsortDescriptorWithKey:@"_age"ascending:YES];
NSSortDescriptor *sortDescriptor2 = [NSSortDescriptorsortDescriptorWithKey:@"_name"ascending:YES];
NSArray *tempArray = [array sortedArrayUsingDescriptors:[NSArrayarrayWithObjects:sortDescriptor1, sortDescriptor2, nil]];
这里的NSArray中的第一元素表示首先按照这个元素的升序或者降序进行排序,对于有重复项的，再按照第二元素进行排序，依次进行类推