IOS几种简单有效的数组排序方法

//第一种，利用数组的sortedArrayUsingComparator调用 NSComparator ，obj1和obj2指的数组中的对象

NSComparator cmptr = ^(id obj1, id obj2){

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

return (NSComparisonResult)NSOrderedDescending;

}

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

return (NSComparisonResult)NSOrderedAscending;

}

return (NSComparisonResult)NSOrderedSame;

};

NSArray *sortArray = [[NSArray alloc] initWithObjects:@"1",@"3",@"4",@"7",@"8",@"2",@"6",@"5",@"13",@"15",@"12",@"20",@"28",@"",nil];

//排序前

NSMutableString *outputBefore = [[NSMutableString alloc] init];

for(NSString *str in sortArray){

[outputBefore appendFormat:@"];

}

NSLog(@"排序前:%@",outputBefore);

[outputBefore release];

//第一种排序

NSArray *array = [sortArray sortedArrayUsingComparator:cmptr];

NSMutableString *outputAfter = [[NSMutableString alloc] init];

for(NSString *str in array){

[outputAfter appendFormat:@"];

}

NSLog(@"排序后:%@",outputAfter);

[outputAfter release];

第二种 排序方法 利用sortedArrayUsingFunction 调用 对应方法customSort，这个方法中的obj1和obj2分别是指数组中的对象。

NSInteger customSort(id obj1, id obj2,void* context){

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

return (NSComparisonResult)NSOrderedDescending;

}

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

return (NSComparisonResult)NSOrderedAscending;

}

return (NSComparisonResult)NSOrderedSame;

}

NSArray *sortArray = [[NSArray alloc] initWithObjects:@"1",@"3",@"4",@"7",@"8",@"2",@"6",@"5",@"13",@"15",@"12",@"20",@"28",@"",nil];

//排序前

NSMutableString *outputBefore = [[NSMutableString alloc] init];

for(NSString *str in sortArray){

[outputBefore appendFormat:@"];

}

NSLog(@"排序前:%@",outputBefore);

[outputBefore release];

NSArray *array = [sortArray sortedArrayUsingFunction:customSort context:nil];

NSMutableString *outputAfter = [[NSMutableString alloc] init];

for(NSString *str in array){

[outputAfter appendFormat:@"];

}

NSLog(@"排序后:%@",outputAfter);

[outputAfter release];

第三种 利用sortUsingDescriptors调用NSSortDescriptor

NSSortDescriptor *sortDescriptor = [[NSSortDescriptor alloc] initWithKey:@"price" ascending:NO];//其中，price为数组中的对象的属性，这个针对数组中存放对象比较更简洁方便

NSArray *sortDescriptors = [[NSArray alloc] initWithObjects:&sortDescriptor count:1];

[_totalInfoArray sortUsingDescriptors:sortDescriptors];

[_airListView refreshTable:_totalInfoArray];

[sortDescriptor release];

[sortDescriptors release];