iOS NSArray NSDictionary 防止崩溃方案

数组

//
//  NSArray+beyond.h
//  HanTest-beyond
//
//  Created by han on 2022/7/25.
//

#import <Foundation/Foundation.h>

NS_ASSUME_NONNULL_BEGIN

@interface NSArray (beyond)

@end

NS_ASSUME_NONNULL_END

//
//  NSArray+beyond.m
//  HanTest-beyond
//
//  Created by han on 2022/8/15.
//

#import "NSArray+beyond.h"
#import <objc/runtime.h>

@implementation NSArray (beyond)
+(void)load{
    [super load];
    [self swizzleMethod];
    [self swizzleMutableMethod];
}

+(void)swizzleMethodWithClassName:(const char * _Nonnull)className  NewSEL:(SEL)newSEL oldSEL:(SEL)oldSEL{
    Method oldObjectAtIndex = class_getInstanceMethod(objc_getClass(className), oldSEL);
    Method newObjectAtIndex = class_getInstanceMethod(objc_getClass(className), newSEL);
    method_exchangeImplementations(oldObjectAtIndex, newObjectAtIndex);
}

#pragma mark - NSArray

+(void)swizzleMethod{
    [self swizzleInit];
    [self swizzleObjectAtIndex];
}

+(void)swizzleInit{
    [self swizzlePlaceholderMethodWithNewSEL:@selector(hook_initWithObjects:count:) oldSEL:@selector(initWithObjects:count:)];
}

+(void)swizzlePlaceholderMethodWithNewSEL:(SEL)newSEL oldSEL:(SEL)oldSEL{
    [self swizzleMethodWithClassName:"__NSPlaceholderArray" NewSEL:newSEL oldSEL:oldSEL];
}
- (instancetype)hook_initWithObjects:(id  _Nonnull const [])objects count:(NSUInteger)cnt{
    
    if (cnt > 0) {
        for (NSUInteger i=0; i<cnt; i++) {
            if(objects[i]==nil){
                [self printError:@"数组存在空值"];
                return @[];
            }
        }
    }
    return [self hook_initWithObjects:objects count:cnt];
}
+ (instancetype)hook_initWithObjects:(id  _Nonnull const [])objects count:(NSUInteger)cnt{
    
    if (cnt > 0) {
        for (NSUInteger i=0; i<cnt; i++) {
            if(objects[i]==nil){
                [self printError:@"数组存在空值"];
                return @[];
            }
        }
    }
    return [self hook_initWithObjects:objects count:cnt];
}
+(void)swizzleObjectAtIndex{
    
    [self swizzleMethodWithClassName:"__NSArrayI" NewSEL:@selector(hook_arrFun1ObjectAtIndex:) oldSEL:@selector(objectAtIndex:)];
    [self swizzleMethodWithClassName:"__NSArray0" NewSEL:@selector(hook_arrFun2ObjectAtIndex:) oldSEL:@selector(objectAtIndex:)];
    [self swizzleMethodWithClassName:"__NSSingleObjectArrayI" NewSEL:@selector(hook_arrFun3ObjectAtIndex:) oldSEL:@selector(objectAtIndex:)];
    [self swizzleMethodWithClassName:"__NSArrayI" NewSEL:@selector(hook_arrFun4ObjectAtIndex:) oldSEL:@selector(objectAtIndexedSubscript:)];
    [self swizzleMethodWithClassName:"NSConstantArray" NewSEL:@selector(hook_arrFun5ObjectAtIndex:) oldSEL:@selector(objectAtIndex:)];
}

///数组越界
-(id)hook_arrFun1ObjectAtIndex:(NSUInteger)index{
    if (index > self.count - 1 || !self.count){
        @try {
            return [self hook_arrFun1ObjectAtIndex:index];
        } @catch (NSException *exception) {
            [self printError:@"数组越界"];
            return nil;
        } @finally {
            
        }
    }
    else{
        return [self hook_arrFun1ObjectAtIndex:index];
    }
}
///数组越界
-(id)hook_arrFun2ObjectAtIndex:(NSUInteger)index{
    if (index > self.count - 1 || !self.count){
        @try {
            return [self hook_arrFun2ObjectAtIndex:index];
        } @catch (NSException *exception) {
            [self printError:@"数组越界"];
            return nil;
        } @finally {
            
        }
    }
    else{
        return [self hook_arrFun2ObjectAtIndex:index];
    }
}
///数组越界
-(id)hook_arrFun3ObjectAtIndex:(NSUInteger)index{
    if (index > self.count - 1 || !self.count){
        @try {
            return [self hook_arrFun3ObjectAtIndex:index];
        } @catch (NSException *exception) {
            [self printError:@"数组越界"];
            return nil;
        } @finally {
            
        }
    }
    else{
        return [self hook_arrFun3ObjectAtIndex:index];
    }
}
///数组越界
-(id)hook_arrFun4ObjectAtIndex:(NSUInteger)index{
    if (index > self.count - 1 || !self.count){
        @try {
            return [self hook_arrFun4ObjectAtIndex:index];
        } @catch (NSException *exception) {
            [self printError:@"数组越界"];
            return nil;
        } @finally {
            
        }
    }
    else{
        return [self hook_arrFun4ObjectAtIndex:index];
    }
}
///数组越界
-(id)hook_arrFun5ObjectAtIndex:(NSUInteger)index{
    if (index > self.count - 1 || !self.count){
        @try {
            return [self hook_arrFun5ObjectAtIndex:index];
        } @catch (NSException *exception) {
            [self printError:@"数组越界"];
            return nil;
        } @finally {
            
        }
    }
    else{
        return [self hook_arrFun5ObjectAtIndex:index];
    }
}
#pragma mark - NSMutableArray
+(void)swizzleMutableMethod{
    [self swizzleMutableObjectAtIndex];
    [self swizzleMutableInsertObject];
}
+(void)swizzleMutableObjectAtIndex{
    [self swizzleMethodWithClassName:"__NSArrayM" NewSEL:@selector(hook_objectAtIndex:) oldSEL:@selector(objectAtIndex:)];
}
-(id)hook_objectAtIndex:(NSUInteger)index{
    
    if (index > self.count - 1 || !self.count){
        @try {
            return [self hook_objectAtIndex:index];
        } @catch (NSException *exception) {
            [self printError:@"数组越界"];
            return nil;
        } @finally {

        }
    }
    else{
        return [self hook_objectAtIndex:index];
    }
    return nil;
}
+(void)swizzleMutableInsertObject{
    [self swizzleMethodWithClassName:"__NSArrayM" NewSEL:@selector(hook_insertObject:atIndex:) oldSEL:@selector(insertObject:atIndex:)];
}

- (void)hook_insertObject:(id)anObject atIndex:(NSUInteger)index{
    if ([self isBlank:anObject]) {
        [self printError:@"添加数据异常"];
    }else if ((self.count + 1 < index)) {
        [self printError:@"添加数据位置异常"];
    }else{
        [self hook_insertObject:anObject atIndex:index];
    }
    
}
#pragma mark - private
- (BOOL)isBlank:(id)obj {
    if (obj == nil)return YES;
    if ([obj isKindOfClass:[NSNull class]]) return YES;
    return NO;
}
+ (BOOL)isBlank:(id)obj {
    if (obj == nil)return YES;
    if ([obj isKindOfClass:[NSNull class]]) return YES;
    return NO;
}
-(void)printError:(NSString *)explain{
    NSLog(@"❌❌❌❌❌❌❌❌❌❌");
    NSLog(@"%@",explain);
    NSLog(@"❌❌❌❌❌❌❌❌❌❌");
}
+(void)printError:(NSString *)explain{
    NSLog(@"❌❌❌❌❌❌❌❌❌❌");
    NSLog(@"%@",explain);
    NSLog(@"❌❌❌❌❌❌❌❌❌❌");
}
@end

字典

//
//  NSDictionary+beyond.h
//  HanTest-beyond
//
//  Created by han on 2022/8/15.
//

#import <Foundation/Foundation.h>

NS_ASSUME_NONNULL_BEGIN

@interface NSDictionary (beyond)

@end

NS_ASSUME_NONNULL_END

//
//  NSDictionary+beyond.m
//  HanTest-beyond
//
//  Created by han on 2022/8/15.
//

#import "NSDictionary+beyond.h"
#import <objc/runtime.h>
@implementation NSDictionary (beyond)

+(void)load{
    [super load];
    [self swizzleMethod];
    [self swizzleMutableMethod];
}

+(void)swizzleMethodWithClassName:(const char * _Nonnull)className  NewSEL:(SEL)newSEL oldSEL:(SEL)oldSEL{
    Method oldObjectAtIndex = class_getInstanceMethod(objc_getClass(className), oldSEL);
    Method newObjectAtIndex = class_getInstanceMethod(objc_getClass(className), newSEL);
    method_exchangeImplementations(oldObjectAtIndex, newObjectAtIndex);
}
#pragma mark - NSDictionary

+(void)swizzleMethod{
    [self swizzleInit];
}
+(void)swizzleInit{
    [self swizzlePlaceholderMethodWithNewSEL:@selector(hook_initWithObjects:forKeys:count:) oldSEL:@selector(initWithObjects:forKeys:count:)];
}

+(void)swizzlePlaceholderMethodWithNewSEL:(SEL)newSEL oldSEL:(SEL)oldSEL{
    [self swizzleMethodWithClassName:"__NSPlaceholderDictionary" NewSEL:newSEL oldSEL:oldSEL];
}
- (instancetype)hook_initWithObjects:(const id [])objects forKeys:(const id<NSCopying> [])keys count:(NSUInteger)cnt {
    id safeObjects[cnt];
    id safeKeys[cnt];
    NSUInteger j = 0;
    for (NSUInteger i = 0; i < cnt; i++) {
        id key = keys[i];
        id obj = objects[i];
        if ([self isBlank:key]) {
            [self printError:@"字典存在Key为空"];
            return nil;
        }
        if ([self isBlank:obj]) {
            [self printError:@"字典存在Value为空"];
            return nil;
        }
        safeKeys[j] = key;
        safeObjects[j] = obj;
        j++;
    }
    return [self hook_initWithObjects:safeObjects forKeys:safeKeys count:j];
}
+ (instancetype)hook_initWithObjects:(const id [])objects forKeys:(const id<NSCopying> [])keys count:(NSUInteger)cnt {
    id safeObjects[cnt];
    id safeKeys[cnt];
    NSUInteger j = 0;
    for (NSUInteger i = 0; i < cnt; i++) {
        id key = keys[i];
        id obj = objects[i];
        if ([self isBlank:key]) {
            [self printError:@"字典存在Key为空"];
            return nil;
        }
        if ([self isBlank:obj]) {
            [self printError:@"字典存在Value为空"];
            return nil;
        }
        safeKeys[j] = key;
        safeObjects[j] = obj;
        j++;
    }
    return [self hook_initWithObjects:safeObjects forKeys:safeKeys count:j];
}


#pragma mark - NSMutableDictionary

+(void)swizzleMutableMethod{
    [self swizzleRemoveObject];
}

+(void)swizzleRemoveObject{
    [self swizzleMethodWithClassName:"__NSDictionaryM" NewSEL:@selector(hook_removeObjectsForKeys:) oldSEL:@selector(removeObjectsForKeys:)];
    [self swizzleMethodWithClassName:"__NSDictionaryM" NewSEL:@selector(hook_removeObjectForKey:) oldSEL:@selector(removeObjectForKey:)];
}
- (void)hook_removeObjectsForKeys:(NSArray *)keyArray{
    for (id obj in keyArray) {
        if ([self isBlank:obj]) {
            [self printError:@"字典 删除存在Key为空"];
            return;
        }
    }
}
- (void)hook_removeObjectForKey:(id)aKey{
    if ([self isBlank:aKey]) {
        [self printError:@"字典 删除存在Key为空"];
        return;
    }
    [self hook_removeObjectForKey:aKey];
}

#pragma mark - private
- (BOOL)isBlank:(id)obj {
    if (obj == nil)return YES;
    if ([obj isKindOfClass:[NSNull class]]) return YES;
    return NO;
}
+ (BOOL)isBlank:(id)obj {
    if (obj == nil)return YES;
    if ([obj isKindOfClass:[NSNull class]]) return YES;
    return NO;
}
-(void)printError:(NSString *)explain{
    NSLog(@"❌❌❌❌❌❌❌❌❌❌");
    NSLog(@"%@",explain);
    NSLog(@"❌❌❌❌❌❌❌❌❌❌");
}
+(void)printError:(NSString *)explain{
    NSLog(@"❌❌❌❌❌❌❌❌❌❌");
    NSLog(@"%@",explain);
    NSLog(@"❌❌❌❌❌❌❌❌❌❌");
}
@end

注：因为该方法是利用runtime进行方法交换，所以会导致部分性能降低，所以对于有性能要求的请慎用此方法。另外一种方案就是自己写一个扩展 NSArray 和 NSDictionary 的方法，然后全局声明，整个工程都要以此为基础进行赋值和取值。

最后编辑于：2022.08.17 09:30:41

人面猴
序言：七十年代末，一起剥皮案震惊了整个滨河市，随后出现的几起案子，更是在滨河造成了极大的恐慌，老刑警刘岩，带你破解...
沈念sama阅读 206,214评论 6赞 481
死咒
序言：滨河连续发生了三起死亡事件，死亡现场离奇诡异，居然都是意外死亡，警方通过查阅死者的电脑和手机，发现死者居然都...
沈念sama阅读 88,307评论 2赞 382
救了他两次的神仙让他今天三更去死
文/潘晓璐我一进店门，熙熙楼的掌柜王于贵愁眉苦脸地迎上来，“玉大人，你说我怎么就摊上这事。” “怎么了？”我有些...
开封第一讲书人阅读 152,543评论 0赞 341
道士缉凶录：失踪的卖姜人
文/不坏的土叔我叫张陵，是天一观的道长。经常有香客问我，道长，这世上最难降的妖魔是什么？我笑而不...
开封第一讲书人阅读 55,221评论 1赞 279
港岛之恋（遗憾婚礼）
正文为了忘掉前任，我火速办了婚礼，结果婚礼上，老公的妹妹穿的比我还像新娘。我一直安慰自己，他们只是感情好，可当我...
茶点故事阅读 64,224评论 5赞 371
恶毒庶女顶嫁案：这布局不是一般人想出来的
文/花漫我一把揭开白布。她就那样静静地躺着，像睡着了一般。火红的嫁衣衬着肌肤如雪。梳的纹丝不乱的头发上，一...
开封第一讲书人阅读 49,007评论 1赞 284
城市分裂传说
那天，我揣着相机与录音，去河边找鬼。笑死，一个胖子当着我的面吹牛，可吹牛的内容都是我干的。我是一名探鬼主播，决...
沈念sama阅读 38,313评论 3赞 399
双鸳鸯连环套：你想象不到人心有多黑
文/苍兰香墨我猛地睁开眼，长吁一口气：“原来是场噩梦啊……” “哼！你这毒妇竟也来了？” 一声冷哼从身侧响起，我...
开封第一讲书人阅读 36,956评论 0赞 259
万荣杀人案实录
序言：老挝万荣一对情侣失踪，失踪者是张志新（化名）和其女友刘颖，没想到半个月后，有当地人在树林里发现了一具尸体，经...
沈念sama阅读 43,441评论 1赞 300
护林员之死
正文独居荒郊野岭守林人离奇死亡，尸身上长有42处带血的脓包…… 初始之章·张勋以下内容为张勋视角年9月15日...
茶点故事阅读 35,925评论 2赞 323
白月光启示录
正文我和宋清朗相恋三年，在试婚纱的时候发现自己被绿了。大学时的朋友给我发了我未婚夫和他白月光在一起吃饭的照片。...
茶点故事阅读 38,018评论 1赞 333
活死人
序言：一个原本活蹦乱跳的男人离奇死亡，死状恐怖，灵堂内的尸体忽然破棺而出，到底是诈尸还是另有隐情，我是刑警宁泽，带...
沈念sama阅读 33,685评论 4赞 322
日本核电站爆炸内幕
正文年R本政府宣布，位于F岛的核电站，受9级特大地震影响，放射性物质发生泄漏。R本人自食恶果不足惜，却给世界环境...
茶点故事阅读 39,234评论 3赞 307
男人毒药：我在死后第九天来索命
文/蒙蒙一、第九天我趴在偏房一处隐蔽的房顶上张望。院中可真热闹，春花似锦、人声如沸。这庄子的主人今日做“春日...
开封第一讲书人阅读 30,240评论 0赞 19
一桩弑父案，背后竟有这般阴谋
文/苍兰香墨我抬头看了看天上的太阳。三九已至，却和暖如春，着一层夹袄步出监牢的瞬间，已是汗流浃背。一阵脚步声响...
开封第一讲书人阅读 31,464评论 1赞 261
情欲美人皮
我被黑心中介骗来泰国打工，没想到刚下飞机就差点儿被人妖公主榨干…… 1. 我叫王不留，地道东北人。一个月前我还...
沈念sama阅读 45,467评论 2赞 352
代替公主和亲
正文我出身青楼，却偏偏与公主长得像，于是被迫代替她去往敌国和亲。传闻我的和亲对象是个残疾皇子，可洞房花烛夜当晚...
茶点故事阅读 42,762评论 2赞 345

iOS NSArray NSDictionary 防止崩溃方案

推荐阅读更多精彩内容