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ios 排序汇总

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


[plain]
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]; 

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。


[plain]
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]; 

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

 

[plain]
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]; 

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];


20120619更新


排序操作,NSArray提供了很多种方法,按照所利用的排序参数,可以简单分为descriptor,selector,function,和block排序。
数组排序的时候有sortedArrayUsingComparator方法,这里的参数为NSComparator,这个类其实是Block所定

补充:移动开发 , IOS ,
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