OC实现的4种排序又来了！
4种排序分别是：快速排序、冒泡排序、选择排序、插入排序，其他的我就不写了，因为OC里的数组中不能存放基本数据类型，如int不能存放，只能放对象，所以所有的数据我用了NSNumber类型，一开始我直接用>、=、<来比较结果排序后还是乱七八糟，后来想起来不能这么比较，对象的比较，可以用compare方法，结果与NSComparisonResult这个枚举类型的数据比较大小就可以了。或者取NSNumber 的intValue，在用>、=、<进行比较，第一个方法中有些两种方式的语句，后来的类似就不写了。
1、快速排序
#pragma - mark 快速排序
+ (void)quickSort:(NSMutableArray *)array low:(int)low high:(int)high
{
if(array == nil || array.count == 0){
return;
}
if (low >= high) {
return;
}
//取中值
int middle = low + (high - low)/2;
NSNumber *prmt = array[middle];
int i = low;
int j = high;
//开始排序，使得leftprmt
while (i <= j) {
// while ([array[i] compare:prmt] == NSOrderedAscending) { 该行与下一行作用相同
while ([array[i] intValue] < [prmt intValue]) {
i++;
}
// while ([array[j] compare:prmt] == NSOrderedDescending) { 该行与下一行作用相同
while ([array[j] intValue] > [prmt intValue]) {
j--;
}
if(i <= j){
[array exchangeObjectAtIndex:i withObjectAtIndex:j];
i++;
j--;
}
printf("排序中:");
[self printArray:array];
}
if (low < j) {
[self quickSort:array low:low high:j];
}
if (high > i) {
[self quickSort:array low:i high:high];
}
}
快速排序的过程如下：
排序前:9 2 10 7 3 7 4
排序中:4 2 10 7 3 7 9
排序中:4 2 7 7 3 10 9
排序中:4 2 7 3 7 10 9
排序中:2 4 7 3 7 10 9
排序中:2 4 3 7 7 10 9
排序中:2 3 4 7 7 10 9
排序中:2 3 4 7 7 9 10
排序中:2 3 4 7 7 9 10
排序后:2 3 4 7 7 9 10
2、冒泡排序
#pragma - mark 冒泡排序
+ (void)buddleSort:(NSMutableArray *)array
{
if(array == nil || array.count == 0){
return;
}
for (int i = 1; i < array.count; i++) {
for (int j = 0; j < array.count - i; j++) {
if ([array[j] compare:array[j+1]] == NSOrderedDescending) {
[array exchangeObjectAtIndex:j withObjectAtIndex:j+1];
}
printf("排序中:");
[self printArray:array];
}
}
}
冒泡排序的过程如下：
排序前:9 2 10 7 3 7 4
排序中:2 9 10 7 3 7 4
排序中:2 9 10 7 3 7 4
排序中:2 9 7 10 3 7 4
排序中:2 9 7 3 10 7 4
排序中:2 9 7 3 7 10 4
排序中:2 9 7 3 7 4 10
排序中:2 9 7 3 7 4 10
排序中:2 7 9 3 7 4 10
排序中:2 7 3 9 7 4 10
排序中:2 7 3 7 9 4 10
排序中:2 7 3 7 4 9 10
排序中:2 7 3 7 4 9 10
排序中:2 3 7 7 4 9 10
排序中:2 3 7 7 4 9 10
排序中:2 3 7 4 7 9 10
排序中:2 3 7 4 7 9 10
排序中:2 3 7 4 7 9 10
排序中:2 3 4 7 7 9 10
排序中:2 3 4 7 7 9 10
排序中:2 3 4 7 7 9 10
排序中:2 3 4 7 7 9 10
排序后:2 3 4 7 7 9 10
3、选择排序
+ (void)selectSort:(NSMutableArray *)array
{
if(array == nil || array.count == 0){
return;
}
int min_index;
for (int i = 0; i < array.count; i++) {
min_index = i;
for (int j = i + 1; j
if ([array[j] compare:array[min_index]] == NSOrderedAscending) {
[array exchangeObjectAtIndex:j withObjectAtIndex:min_index];
}
printf("排序中:");
[self printArray:array];
}
}
}
选择排序的过程如下：
排序前:9 2 10 7 3 7 4
排序中:2 9 10 7 3 7 4
排序中:2 9 10 7 3 7 4
排序中:2 9 10 7 3 7 4
排序中:2 9 10 7 3 7 4
排序中:2 9 10 7 3 7 4
排序中:2 9 10 7 3 7 4
排序中:2 9 10 7 3 7 4
排序中:2 7 10 9 3 7 4
排序中:2 3 10 9 7 7 4
排序中:2 3 10 9 7 7 4
排序中:2 3 10 9 7 7 4
排序中:2 3 9 10 7 7 4
排序中:2 3 7 10 9 7 4
排序中:2 3 7 10 9 7 4
排序中:2 3 4 10 9 7 7
排序中:2 3 4 9 10 7 7
排序中:2 3 4 7 10 9 7
排序中:2 3 4 7 10 9 7
排序中:2 3 4 7 9 10 7
排序中:2 3 4 7 7 10 9
排序中:2 3 4 7 7 9 10
排序后:2 3 4 7 7 9 10
4、插入排序
#pragma - mark 插入排序
+ (void)inserSort:(NSMutableArray *)array
{
if(array == nil || array.count == 0){
return;
}
for (int i = 0; i < array.count; i++) {
NSNumber *temp = array[i];
int j = i-1;
while (j >= 0 && [array[j] compare:temp] == NSOrderedDescending) {
[array replaceObjectAtIndex:j+1 withObject:array[j]];
j--;
printf("排序中:");
[self printArray:array];
}
[array replaceObjectAtIndex:j+1 withObject:temp];
}
}
插入排序的过程如下：
排序前:9 2 10 7 3 7 4
排序中:9 9 10 7 3 7 4
排序中:2 9 10 10 3 7 4
排序中:2 9 9 10 3 7 4
排序中:2 7 9 10 10 7 4
排序中:2 7 9 9 10 7 4
排序中:2 7 7 9 10 7 4
排序中:2 3 7 9 10 10 4
排序中:2 3 7 9 9 10 4
排序中:2 3 7 7 9 10 10
排序中:2 3 7 7 9 9 10
排序中:2 3 7 7 7 9 10
排序中:2 3 7 7 7 9 10
排序后:2 3 4 7 7 9 10
另外，类的代码也附上吧！
#import
@interface SortUtil : NSObject
//快速排序
+ (void)quickSort:(NSMutableArray *)array low:(int)low high:(int)high;
//冒泡排序
+ (void)buddleSort:(NSMutableArray *)array;
//选择排序
+ (void)selectSort:(NSMutableArray *)array;
//插入排序
+ (void)inserSort:(NSMutableArray *)array;
//打印数组
+ (void)printArray:(NSArray *)array;
@end
#import "SortUtil.h"
@implementation SortUtil
#pragma - mark 快速排序
+ (void)quickSort:(NSMutableArray *)array low:(int)low high:(int)high
{
if(array == nil || array.count == 0){
return;
}
if (low >= high) {
return;
}
//取中值
int middle = low + (high - low)/2;
NSNumber *prmt = array[middle];
int i = low;
int j = high;
//开始排序，使得leftprmt
while (i <= j) {
// while ([array[i] compare:prmt] == NSOrderedAscending) { 该行与下一行作用相同
while ([array[i] intValue] < [prmt intValue]) {
i++;
}
// while ([array[j] compare:prmt] == NSOrderedDescending) { 该行与下一行作用相同
while ([array[j] intValue] > [prmt intValue]) {
j--;
}
if(i <= j){
[array exchangeObjectAtIndex:i withObjectAtIndex:j];
i++;
j--;
}
printf("排序中:");
[self printArray:array];
}
if (low < j) {
[self quickSort:array low:low high:j];
}
if (high > i) {
[self quickSort:array low:i high:high];
}
}
#pragma - mark 冒泡排序
+ (void)buddleSort:(NSMutableArray *)array
{
if(array == nil || array.count == 0){
return;
}
for (int i = 1; i < array.count; i++) {
for (int j = 0; j < array.count - i; j++) {
if ([array[j] compare:array[j+1]] == NSOrderedDescending) {
[array exchangeObjectAtIndex:j withObjectAtIndex:j+1];
}
printf("排序中:");
[self printArray:array];
}
}
}
#pragma - mark 选择排序
+ (void)selectSort:(NSMutableArray *)array
{
if(array == nil || array.count == 0){
return;
}
int min_index;
for (int i = 0; i < array.count; i++) {
min_index = i;
for (int j = i + 1; j
if ([array[j] compare:array[min_index]] == NSOrderedAscending) {
[array exchangeObjectAtIndex:j withObjectAtIndex:min_index];
}
printf("排序中:");
[self printArray:array];
}
}
}
#pragma - mark 插入排序
+ (void)inserSort:(NSMutableArray *)array
{
if(array == nil || array.count == 0){
return;
}
for (int i = 0; i < array.count; i++) {
NSNumber *temp = array[i];
int j = i-1;
while (j >= 0 && [array[j] compare:temp] == NSOrderedDescending) {
[array replaceObjectAtIndex:j+1 withObject:array[j]];
j--;
printf("排序中:");
[self printArray:array];
}
[array replaceObjectAtIndex:j+1 withObject:temp];
}
}
+ (void)printArray:(NSArray *)array
{
for(NSNumber *number in array) {
printf("%d ",[number intValue]);
}
printf("\n");
}
@end
调用我就写在了app启动的方法里：
- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions
{
self.window = [[UIWindow alloc] initWithFrame:[[UIScreen mainScreen] bounds]];
// Override point for customization after application launch.
self.window.backgroundColor = [UIColor whiteColor];
[self.window makeKeyAndVisible];
NSMutableArray *array = [NSMutableArray arrayWithObjects:@9,@2,@10,@7,@3,@7,@4,nil];
printf("排序前:");
[SortUtil printArray:array];
//快速排序
// [SortUtil quickSort:array low:0 high:6];
//冒泡排序
// [SortUtil buddleSort:array];
//选择排序
// [SortUtil selectSort:array];
//插入排序
[SortUtil inserSort:array];
printf("排序后:");
[SortUtil printArray:array];
return YES;
}
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