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sortedArrayUsing相关总结
很强大
1.sortedArrayUsingSelector
（按Key值大小对NSDictionary排序）
NSMutableArray *array = [NSMutableArray arrayWithObjects: [NSDictionary dictionaryWithObjectsAndKeys:@"Obj0", [NSNumber numberWithInt:0], nil], [NSDictionary dictionaryWithObjectsAndKeys:@"Obj5", [NSNumber numberWithInt:5], nil], [NSDictionary dictionaryWithObjectsAndKeys:@"Obj2", [NSNumber numberWithInt:2], nil], [NSDictionary dictionaryWithObjectsAndKeys:@"Obj3", [NSNumber numberWithInt:3], nil], [NSDictionary dictionaryWithObjectsAndKeys:@"Obj1", [NSNumber numberWithInt:1], nil], [NSDictionary dictionaryWithObjectsAndKeys:@"Obj4", [NSNumber numberWithInt:4], nil], nil]; 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一个
- (NSComparisonResult)compare: (NSDictionary *)otherDictionary{ NSDictionary *tempDictionary = (NSDictionary *)self; NSNumber *number1 = [[tempDictionary allKeys] objectAtIndex:0]; NSNumber *number2 = [[otherDictionary allKeys] objectAtIndex:0]; NSComparisonResult result = [number1 compare:number2]; return result == NSOrderedDescending; // 升序// return result == NSOrderedAscending; // 降序}2.sortedArrayUsingComparator
NSMutableArray *array = [NSMutableArray arrayWithObjects: [NSDictionary dictionaryWithObjectsAndKeys:@"Obj0", [NSNumber numberWithInt:0], nil], [NSDictionary dictionaryWithObjectsAndKeys:@"Obj5", [NSNumber numberWithInt:5], nil], [NSDictionary dictionaryWithObjectsAndKeys:@"Obj2", [NSNumber numberWithInt:2], nil], [NSDictionary dictionaryWithObjectsAndKeys:@"Obj3", [NSNumber numberWithInt:3], nil], [NSDictionary dictionaryWithObjectsAndKeys:@"Obj1", [NSNumber numberWithInt:1], nil], [NSDictionary dictionaryWithObjectsAndKeys:@"Obj4", [NSNumber numberWithInt:4], nil], nil]; // NSArray *resultArray = [array sortedArrayUsingSelector:@selector(compare:)]; NSArray *resultArray = [array sortedArrayUsingComparator:^NSComparisonResult(id obj1, id obj2) { NSNumber *number1 = [[obj1 allKeys] objectAtIndex:0]; NSNumber *number2 = [[obj2 allKeys] objectAtIndex:0]; NSComparisonResult result = [number1 compare:number2]; return result == NSOrderedDescending; // 升序// return result == NSOrderedAscending; // 降序 }];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
接下来根据一个对象的属性，排列这个对象
.h@interface Person : NSObject{ NSString *_name; NSInteger _age;}@property (nonatomic, retain) NSString *name;@property (nonatomic, assign) NSInteger age;@end.m@implementation Person@synthesize name = _name;@synthesize age = _age;- (void)dealloc{ [_name release]; [super dealloc];}@end排序方法的实现
Person *person1 = [[Person alloc] init]; [person1 setName:@"ABC"]; [person1 setAge:24]; Person *person2 = [[Person alloc] init]; [person2 setName:@"ACB"]; [person2 setAge:22]; Person *person3 = [[Person alloc] init]; [person3 setName:@"ABD"]; [person3 setAge:33]; NSMutableArray *array = [NSMutableArray arrayWithObjects:person1, person2, person3, nil]; [person1 release]; [person2 release]; [person3 release]; //这里类似KVO的读取属性的方法，直接从字符串读取对象属性，注意不要写错 NSSortDescriptor *sortDescriptor = [NSSortDescriptor sortDescriptorWithKey:@"_age" ascending:YES]; //这个数组保存的是排序好的对象 NSArray *tempArray = [array sortedArrayUsingDescriptors:[NSArray arrayWithObject:sortDescriptor]]; for(NSInteger i = 0; i < [tempArray count]; i++) { NSLog(@"%@--------%d\n", [[tempArray objectAtIndex:i] name], [[tempArray objectAtIndex:i] age]); }//下面是可变数组的方法 // [array sortUsingDescriptors:[NSArray arrayWithObject:sortDescriptor]];// // for(NSInteger i = 0; i < [array count]; i++)// {// NSLog(@"%@--------%d\n", [[array objectAtIndex:i] name], [[array objectAtIndex:i] age]);// }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
sortedArrayUsing相关总结
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