ios队列 ios实现简易队列
zyw658000 人气:0满足一些特殊需求
接口部分(队列支持需求)
#import <Foundation/Foundation.h> @interface XMQueue : NSObject ///队列追加 - (void)add:(id) obj; ///队列取出 - (id)next; ///返回队列最前端,不删除队列内元素 - (id)first; ///队列内是否还有元素 - (BOOL) isEmpty; ///队列转array - (NSArray *) arrayCopy; @end
实现方法
#import "XMQueue.h"
@interface XMQueue()
@property NSMutableArray *array;
@property NSInteger currentIndex;
@end
@implementation XMQueue
- (instancetype)init
{
self = [super init];
if (self) {
self.array = [[NSMutableArray alloc] initWithCapacity:32];
}
return self;
}
- (void)add:(id) obj{
if (self.currentIndex >= self.array.count-1) {
NSMutableArray *newArray = [[NSMutableArray alloc] initWithCapacity:self.array.count*2];
for (id obj in self.array) {
[newArray addObject:obj];
}
self.array = newArray;
}
[self.array addObject:obj];
}
- (id)next{
if (![self isEmpty]) {
id obj = [self.array objectAtIndex:0];
[self.array removeObjectAtIndex:0];
return obj;
}else{
return @"Empty";
}
}
- (id)first{
if (![self isEmpty]) {
return self.array[0];
}else{
return @"Empty";
}
}
- (BOOL) isEmpty{
return self.array.count == 0;
}
@end
测试
XMQueue *queue = [[XMQueue alloc] init];
for (int i = 0; i < 5; i++) {
[queue add:[NSNumber numberWithInt:i]];
}
for (NSNumber *number in [queue arrayCopy]) {
printf("%d,",[number intValue]);
}
printf("\n");
[queue add:[queue next]];
for (NSNumber *number in [queue arrayCopy]) {
printf("%d,",[number intValue]);
}
printf("\n");
[queue add:[queue next]];
for (NSNumber *number in [queue arrayCopy]) {
printf("%d,",[number intValue]);
}
printf("\n");
[queue add:[queue next]];
for (NSNumber *number in [queue arrayCopy]) {
printf("%d,",[number intValue]);
}
printf("\n");
[queue add:[queue next]];
for (NSNumber *number in [queue arrayCopy]) {
printf("%d,",[number intValue]);
}
printf("\n");
[queue add:[queue next]];
for (NSNumber *number in [queue arrayCopy]) {
printf("%d,",[number intValue]);
}
结果
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