NSString倒序

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最新推荐文章于 2020-05-26 15:02:49 发布
原创 最新推荐文章于 2020-05-26 15:02:49 发布 · 198 阅读 · 0 ·
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博客提及了iOS，这是移动开发领域的重要系统，在移动应用开发等方面有广泛应用。

ios

字符串倒序输出
Grecss的博客
04-26 534
原题是在Codewars上 要求是reverse(“Hello World”) == “World Hello” reverse(“Hi There.”) == “there. Hi” #import <Foundation/Foundation.h> NSString* reverse(NSString* text) { //字符串变...
一个iOS上的秒表小应用的实现方法分享
01-05
2.计次数据的倒序排列，即计次1的数据在最底端，依次向上为计次2，计次3的时间数据 我的实现： ARC省去了我们自行管理内存的大部分事情，写惯了c++于是舒服了很多 代码如下: – (IBAction) startOrstop:(UIButton *...
NSString 倒序输出
WandotaDeGou的专栏
05-01 1002
-(NSString *)inputValue:(NSString *)str{     NSMutableString *string=[[NSMutableString alloc] init];     for(int i=0;ilength;i++){         [string appendString:[str substringWithRange:
关于NSString字符串反转的问题
wsjshx的专栏
09-05 1170
今天看到这个“Objective-C分割NSString”，有人用正则表达式进行解答，感觉很特别。所以就把以前遇到的字符串反转的问你拿出来讨论讨论，可不可以用正则表达式来解决呢？ 下面是个最简单的实现的如有什么效率问题，边界问题也希望多给意见。 /**** NSString+Reverse.h ****/ #import @interface NSString (Reverse) - (
NSString反向查找字符串
yuanya的专栏
11-07 4586
让我们再看另一个示例，下述代码将从字符串的末尾开始向前搜索“ia”字符串： NSString *homebrew= @"ImperialIndia Pale Ale (IPA)"; //从末尾开始搜索"ia"字符串 NSRange range = [homebrew rangeOfString:@"ia"options:NSBackwardsSearch]; //判别查找到的字符串是否正确
字符串倒序
Mr.Xie的博客
05-31 544
public class InvertedString { public static String inverted(String str) { if (str == null || str.length() == 0) { return str; } int len = str.length(); ...
iOS NSString字符串反转的问题
HHuiHao
05-14 4322
/**** NSString+Reverse.h ****/ #import @interface NSString (Reverse) - (NSString *)stringByReversed; @end /**** NSString+Reverse.m ****/ #import "NSString+Reverse.h" @implementation NSString (Revers
解析这个m文件，并思考这个manager需要重点注意的地方 // // SDNDeviceDownloadImageManager.m // Omada // // Created by wanghao on 2025/2/12. // Copyright © 2025 TP-Link. All rights reserved. // #import "SDNDeviceDownloadImageManager.h" #import "TPDataStorage.h" #import "SDWebImageManager.h" #import "DMSDNDeviceImageInfo.h" NSString *const kDeviceDownloadFirstVersion = @"0"; static const NSInteger kSDNDeviceDownloadDefaultCacheMaxCacheAge = 365 * 24 * 60 * 60 * 50; // 50 years static const NSInteger kSDNDeviceDownloadDefaultCacheMinUpdateInterval = 3 * 24 * 60 * 60; // 3 days @interface SDNDeviceDownloadImageManager () @property (nonatomic, readwrite, strong) TPECFetchDeviceIconModule *deviceIconModule; @property (nonatomic, readwrite, strong) TPAbstractHandle *checkDeviceUpdateHandle; @property (nonatomic, readwrite, copy) NSArray<DMSDNDeviceImageInfo *> *updateDeviceImageList; @property (nonatomic, readwrite, strong) SDWebImageDownloader *imageDownloader; @property (nonatomic, readwrite, strong) SDImageCache *imageCache; @property (nonatomic, readwrite, assign) BOOL isDownloading; @end @implementation SDNDeviceDownloadImageManager + (instancetype)sharedInstance { static id instance = nil; static dispatch_once_t onceToken; dispatch_once(&onceToken, ^{ instance = [[self alloc] init]; }); return instance; } - (instancetype)init { self = [super init]; if (self) { self.imageCache = [[SDImageCache alloc]initWithNamespace:@"OmadaDeviceStore"]; self.imageCache.maxCacheAge = kSDNDeviceDownloadDefaultCacheMaxCacheAge; self.imageDownloader = [SDWebImageDownloader sharedDownloader]; self.deviceIconModule = [ALAccountContext sharedInstance].eapCloudClient.fetchDeviceIconModule; self.updateDeviceImageList = [NSArray new]; self.isDownloading = NO; } return self; } - (TPAbstractHandle *)checkDeviceUpgrade { if (self.checkDeviceUpdateHandle) { return self.checkDeviceUpdateHandle; } NSString *currentVersion = [[TSSUserDefaults standardUserDefaults] objectForKey:TPDeviceIconCurrentVersionKey]; if (IsEmptyString(currentVersion)) { currentVersion = kDeviceDownloadFirstVersion; } TPWeakSelf TPQueueHandleFactoryBlock blck1 = ^TPAbstractHandle* (TPQueueHandleBlockContext* context){ TPStrongSelfNoReturn return [_self.deviceIconModule checkNeedUpgradeWithCurrentVersion:currentVersion]; }; TPQueueHandleFactoryBlock blck2 = ^TPAbstractHandle* (TPQueueHandleBlockContext* context){ TPStrongSelfNoReturn if(context.lastResult.success) { BOOL needCheckUp = _self.deviceIconModule.needUpdate; if (needCheckUp) { return [_self.deviceIconModule getDeviceIconWithCurrentVersion:currentVersion]; } } context.stop = YES; context.stopResult = context.lastResult; return nil; }; TPGCDQueueHandle *queueHandle = [[TPGCDQueueHandle alloc] initWithQueue:dispatch_get_main_queue() factoryBlockArray:@[blck1, blck2] timeout:-1]; [queueHandle addCompletionOnMainThread:^(TPHandleResult * _Nonnull result) { TPStrongSelf _self.checkDeviceUpdateHandle = nil; if (result.success) { _self.updateDeviceImageList = _self.deviceIconModule.updateDeviceImageList; if (_self.updateDeviceImageList.count > 0 && _self.deviceIconModule.needUpdate) { [_self downLoadUpdatedDeviceImage]; } } }]; return queueHandle; } - (void)updateCacheInfo { NSTimeInterval lastTime = 0.0; NSNumber *lastShowTimestampObject = [[TSSUserDefaults standardUserDefaults] objectForKey:TPDeviceIconLastUpdateTimeKey]; if (lastShowTimestampObject) { lastTime = [lastShowTimestampObject doubleValue]; } //上次更新时间距离现在超过最小间隔，则重新拉取设备图标 if (lastTime + kSDNDeviceDownloadDefaultCacheMinUpdateInterval < [[NSDate date] timeIntervalSince1970] && !self.isDownloading) { self.isDownloading = YES; [self resetCacheInfo]; [self checkDeviceUpgrade]; } } - (void)resetCacheInfo { [[TSSUserDefaults standardUserDefaults] setObject:kDeviceDownloadFirstVersion forKey:TPDeviceIconCurrentVersionKey]; [[TSSUserDefaults standardUserDefaults] setObject:[NSArray new] forKey:TPDeviceIconMdelListKey]; } - (void)storeDeviceModelList:(NSString *)modelAndVersionKey { if (IsEmptyString(modelAndVersionKey)) { return; } NSArray<NSString *> *imageList = [self deviceIconModelList]; for (NSString *itemImage in imageList) { if ([modelAndVersionKey isEqualToString:itemImage]) { return; } } imageList = [imageList arrayByAddingObject:modelAndVersionKey]; [[TSSUserDefaults standardUserDefaults] setObject:imageList forKey:TPDeviceIconMdelListKey]; } - (void)downLoadUpdatedDeviceImage { self.isDownloading = YES; __block int handledCount = 0; for (DMSDNDeviceImageInfo *deviceImageInfo in self.updateDeviceImageList) { if ([self.imageCache diskImageExistsWithKey:deviceImageInfo.modelAndVersionKey] || deviceImageInfo.imageDownLoadURL == nil) { [self storeDeviceModelList:deviceImageInfo.modelAndVersionKey]; handledCount++; [self updateControllerVersionWithTotalCount:handledCount]; continue; } TPWeakSelf [self.imageDownloader downloadImageWithURL:deviceImageInfo.imageDownLoadURL options:0 progress:nil completed:^(UIImage *image, NSData *data, NSError *error, BOOL finished) { TPStrongSelf handledCount++; [_self.imageCache storeImage:image recalculateFromImage:NO imageData:data forKey:deviceImageInfo.modelAndVersionKey toDisk:YES]; [self storeDeviceModelList:deviceImageInfo.modelAndVersionKey]; [[TSSUserDefaults standardUserDefaults] setObject:@([[NSDate date] timeIntervalSince1970]) forKey:TPDeviceIconLastUpdateTimeKey]; [_self updateControllerVersionWithTotalCount:handledCount]; }]; } } - (void)updateControllerVersionWithTotalCount:(int)totalCount { if (totalCount == self.updateDeviceImageList.count) { NSString *curVersion = [ALAccountContext sharedInstance].eapCloudClient.fetchDeviceIconModule.controllerVersion; [[TSSUserDefaults standardUserDefaults] setObject:curVersion forKey:TPDeviceIconCurrentVersionKey]; } } - (BOOL)hasDownLoadDevice:(NSString *)modelAndVersionKey { if (IsEmptyString(modelAndVersionKey)) { return NO; } return [self.imageCache diskImageExistsWithKey:modelAndVersionKey];; } - (UIImage *)deviceImage:(NSString *)deviceModel andModelVersion:(NSString *)modelVersion { NSString *modelAndVersionKey = [DMSDNDeviceImageInfo modelAndVersionKeyFromModel:deviceModel andVersion:modelVersion]; if (IsEmptyString(modelAndVersionKey)) { return nil; } UIImage *image = [self deviceImageFromModelAndVersionKey:modelAndVersionKey]; UIImage *finalImage = image == nil ? [self vigiDeviceImage:modelAndVersionKey] : image; if (finalImage == nil) { [self updateCacheInfo]; } return finalImage; } - (UIImage *)deviceImageFromModelAndVersionKey:(NSString *)modelAndVersionKey { UIImage *image = [self.imageCache imageFromDiskCacheForKey:modelAndVersionKey]; return image; } - (NSArray<NSString *> *)deviceIconModelList { NSArray<NSString *> *deviceModelList = [[TSSUserDefaults standardUserDefaults] objectForKey:TPDeviceIconMdelListKey]; return deviceModelList == nil ? [NSArray new] : deviceModelList; } - (UIImage *)vigiDeviceImage:(NSString *)modelAndVersionKey { NSArray<NSString *> *modelList = [self deviceIconModelList]; modelList = [modelList sortedArrayUsingComparator:^NSComparisonResult(NSString * obj1, NSString * obj2) { return obj1.length < obj2.length; }]; for (NSString *modelStr in modelList) { if (!IsEmptyString(modelAndVersionKey) && [modelAndVersionKey containsString:modelStr]) { return [self deviceImageFromModelAndVersionKey:modelStr]; } } return nil; } @end
最新发布
10-31
- **`vigiDeviceImage:` 逻辑**：按字符串长度倒序匹配可能导致错误关联（如 `"iPhone13"` 匹配到 `"iPhone13Pro"`）。 - **建议**：定义明确的设备型号层级规则。 --- ### **典型问题场景与修复** #### 场景：...
iOS秒表应用实现：计时与计次功能解析
这部分代码没有提供，但可以假设它会计算并更新 `time` 变量，然后使用 `NSString` 的 `stringWithFormat:` 方法生成格式化的时间字符串，赋值给 `UILabel` 的 `text` 属性。 在实际的秒表应用中，除了这些基本功能...
ios-NSPredicate用于查询.zip
07-11
NSString *nameToFind = @"John"; NSPredicate *predicate = [NSPredicate predicateWithFormat:@"name == %@", nameToFind]; NSArray *filteredPersons = [persons filteredArrayUsingPredicate:predicate]; ``` ...
iOS -- 字符串倒序输出
Lazar_lvq的专栏
12-05 808
NSString *string=@"123456789";     NSMutableString *str =[NSMutableString string];     for (int a=string.length-1; a>=0; a--)     {         unsigned short st = [string characterAtIndex:a];      
iOS开发 字符串倒序的两种方式，首尾互换
迦南的专栏
05-26 992
在面试中，经常被问到字符串倒序的面试题，下面提供两种简单的实现： 第一种： - (NSString*)reverseWordsInString:(NSString*)oldStr{ NSMutableString *newStr = [[NSMutableString alloc] initWithCapacity:oldStr.length]; for (int i = (int)oldStr.length - 1; i >= 0; i --) { uni..
OC 中字符串倒叙输出
my2673660931的专栏
04-15 710
只用5行代码就实现了字符串的倒叙输出 1.实现了字符串(非汉字的倒叙) NSString *string = @"q,w,e,r";     NSMutableString *newString = [[NSMutableString alloc] initWithCapacity:string.length];     for (NSInteger i =
IOS中怎样把一个字符串倒序输出
UT1236的博客
07-17 554
NSString * str = @"abcdefg"; NSMutableString * string = [[NSMutableString alloc]initWithCapacity:str.length]; int j = (int)str.length; for (int i = j - 1; i >= 0; i--) { ...
面试题：字符串倒序输出
业精于勤-行成于思
08-25 4439
面试题：字符串倒序输出
对字符串倒过来输出的几种处理方法。
程序猿?工程狮!
03-14 5866
package net.avadio; import java.util.Stack; public class StringReverse { public static String reverse1(String s) { int length = s.length(); if (length return s; String left = s.sub
ios 字符串逆序
shuang_girl的博客
04-10 1145
//完全逆序 输入“1234” 输出“4321”-(NSString *)inputValue:(NSString *)str{    NSMutableString *string=[[NSMutableString alloc] init];    for(int i=0;i&lt;str.length;i++){        [string appendString:[str substr...
iOS中如何判断NSString是否为空
在iOS开发中，字符串处理是一个常见的任务，而对NSString对象进行是否为空的判断是基础中的基础。NSString是Objective-C语言中用于表示字符串的类，提供了丰富的接口以支持对字符串的各种操作。在Objective-C中，...
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