Collection <__NSArrayM: 0x> was mutated while being enumerated.

最新推荐文章于 2023-02-14 18:12:06 发布
最新推荐文章于 2023-02-14 18:12:06 发布
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分类专栏： iOS开发 文章标签： 数组遍历出错 数组遍历并修改 枚举
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本文链接：https://blog.youkuaiyun.com/biangabiang/article/details/77102045
本文介绍了在遍历数组过程中对元素进行修改时遇到的问题及两种解决方法：一是创建新数组并对其进行操作；二是使用枚举方式遍历。

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这个问题是因为在遍历数组的时候对数组元素进行了修改，我是在遍历的时候删除了元素，然后就报错了。
通过查资料找到两个解决方案：
1.创建一个一样的数组，对新数组进行遍历，然后对原来的数组进行修改或删除。
2.通过枚举的方式进行遍历

[array enumerateObjectsUsingBlock:^(id  _Nonnull obj, NSUInteger idx, BOOL * _Nonnull stop) {
       //修改数组元素
    }];
Bug-iOS: Collection <__NSArrayM: 0x> was mutated while being enumerated.
lf20105103039的专栏
02-04 690
[objc] view plaincopy //init a NSArray   NSMutableArray *arr2 = [NSMutableArray array];   for (int i=0; i10; ++i) {       NSMutableDictionary *d = [NSMutableDictionary dictionaryWith
NSArray使用小技巧
一滴清水
09-18 706
在IOS开发中，我们经常用的NSArray或者NSMutableArray ,但是当使用不当的时候，会有下面的错误提示。 Collection NSArrayM: 0xxxxxxx> was mutated while being enumerated. 遇到这类错误的时候，是同时对同一个数组进行了操作。 *这里说的是数组，其实别的类型的对象也出现这个
was mutated while being enumerated.-terminate called throwing&nbsp
836811384
06-04 155
遇到一个问题，跟踪了半天才发现原因。(现象是，客户老是说在下载的过程中，过一会就出现崩溃的现象， 只要点了下载按钮， 不做任何操作， 然后期刊就开始正常下载了，过大概5分钟后，再去看，程序就已经崩溃了) 在做《时装传媒》ipad应用时，首页的下载页面，下载时，会不断地去更新页面上的下载进度，同时还有一个15秒的timer, 会每15秒切换当前显示的是男装，女装或者艺术刊页面。这个tim...
iOS_报错"Collection NSArrayM was mutated while being enumerated"
jacob_ios的博客
02-28 1843
在通讯录搜索时会不停的遍历数组源，获取匹配的用户信息用于展示，此时出现BUG。报错：崩溃并报错“Collection &lt;__NSArrayM: 0x166105d0&gt; was mutated while being enumerated”。原因1：数组遍历时修改了数组。解决方法：定义一个新数组，修改新数组原因2：不同的线程同时读取和修改了数组。解决方法： [userList enume...
#include "../utils.h" #include "StringLengthVariance.h" #include <algorithm> #include <vector> std::vector<std::shared_ptr<StringBase>> StringLengthVariance::mutated_elements; StringLengthVariance::StringLengthVariance(std::shared_ptr<StringBase> obj, std::mt19937 &rand) : IntegerVariance(std::static_pointer_cast<StringBase>(obj), rand, false) {} std::pair<int64_t, int64_t> StringLengthVariance::get_limits(std::shared_ptr<StringBase> obj) { /* TODO:获取长度边界代码待完善 */ int64_t max_output_size_bits = static_cast<int64_t>(obj->mutator_config.max_output_size * 8); int64_t size_bits = llrint(obj->calculate_bit_size()); int64_t limit_bits = std::max(max_output_size_bits, size_bits); int64_t limit_bytes = (limit_bits + 7) / 8; int64_t max_length = limit_bytes; if (obj->max_length != nullptr) { max_length = std::min(limit_bytes, static_cast<int64_t>(obj->max_length.value())); } int64_t min_length = 0; if (obj->min_length.has_value()) { min_length = std::max(0LL, static_cast<int64_t>(obj->min_length.value())); } return {min_length, max_length}; } int64_t StringLengthVariance::get_value(std::shared_ptr<StringBase> obj) { return std::min(static_cast<int64_t>(obj->value.size()), max_); } void StringLengthVariance::perform_mutation(std::shared_ptr<StringBase> obj, int64_t value) { obj->mutated_value = expand(obj->value, static_cast<size_t>(value)); obj->mutated = true; mutated_elements.push_back(obj); } bool StringLengthVariance::supported(std::shared_ptr<StringBase> obj) { return std::dynamic_pointer_cast<StringBase>(obj) != nullptr; } std::vector<std::shared_ptr<StringBase>> StringLengthVariance::get_mutated_elements() { return mutated_elements; }报错/data/k50048780/cpp_mutator/mutators/string/StringLengthVariance.cpp: In member function ‘virtual std::pair<long int, long int> StringLengthVariance::get_limits(std::shared_ptr<StringBase>)’: /data/k50048780/cpp_mutator/mutators/string/StringLengthVariance.cpp:24:25: error: request for member ‘has_value’ in ‘((std::__shared_ptr_access<StringBase, __gnu_cxx::_S_atomic, false, false>*)(& obj))->std::__shared_ptr_access<StringBase, __gnu_cxx::_S_atomic, false, false>::operator->()->StringBase::<anonymous>.TypeBase<StringBase>::max_length’, which is of non-class type ‘int64_t’ {aka ‘long int’} 24 | if (obj->max_length.has_value()) { | ^~~~~~~~~ /data/k50048780/cpp_mutator/mutators/string/StringLengthVariance.cpp:25:81: error: request for member ‘value’ in ‘((std::__shared_ptr_access<StringBase, __gnu_cxx::_S_atomic, false, false>*)(& obj))->std::__shared_ptr_access<StringBase, __gnu_cxx::_S_atomic, false, false>::operator->()->StringBase::<anonymous>.TypeBase<StringBase>::max_length’, which is of non-class type ‘int64_t’ {aka ‘long int’} 25 | max_length = std::min(limit_bytes, static_cast<int64_t>(obj->max_length.value())); | ^~~~~ /data/k50048780/cpp_mutator/mutators/string/StringLengthVariance.cpp:28:25: error: request for member ‘has_value’ in ‘((std::__shared_ptr_access<StringBase, __gnu_cxx::_S_atomic, false, false>*)(& obj))->std::__shared_ptr_access<StringBase, __gnu_cxx::_S_atomic, false, false>::operator->()->StringBase::<anonymous>.TypeBase<StringBase>::min_length’, which is of non-class type ‘int64_t’ {aka ‘long int’} 28 | if (obj->min_length.has_value()) { | ^~~~~~~~~ /data/k50048780/cpp_mutator/mutators/string/StringLengthVariance.cpp:29:73: error: request for member ‘value’ in ‘((std::__shared_ptr_access<StringBase, __gnu_cxx::_S_atomic, false, false>*)(& obj))->std::__shared_ptr_access<StringBase, __gnu_cxx::_S_atomic, false, false>::operator->()->StringBase::<anonymous>.TypeBase<StringBase>::min_length’, which is of non-class type ‘int64_t’ {aka ‘long int’} 29 | min_length = std::max(0LL, static_cast<int64_t>(obj->min_length.value())); | ^~~~~ /data/k50048780/cpp_mutator/mutators/string/StringLengthVariance.cpp: At global scope: /data/k50048780/cpp_mutator/mutators/string/StringLengthVariance.cpp:48:42: error: no declaration matches ‘std::vector<std::shared_ptr<StringBase> > StringLengthVariance::get_mutated_elements()’ 48 | std::vector<std::shared_ptr<StringBase>> StringLengthVariance::get_mutated_elements() { | ^~~~~~~~~~~~~~~~~~~~ /data/k50048780/cpp_mutator/mutators/string/StringLengthVariance.cpp:48:42: note: no functions named ‘std::vector<std::shared_ptr<StringBase> > StringLengthVariance::get_mutated_elements()’ In file included from /data/k50048780/cpp_mutator/mutators/string/StringLengthVariance.cpp:6: /data/k50048780/cpp_mutator/mutators/string/StringLengthVariance.h:13:7: note: ‘class StringLengthVariance’ defined here 13 | class StringLengthVariance : public IntegerVariance { | ^~~~~~~~~~~~~~~~~~~~
07-01
在头文件中，我们可能需要在类中声明这个静态成员：class StringLengthVariance :public IntegerVariance{...private:staticstd::vector<std::shared_ptr<StringBase>>mutated_elements;public:static std::vector...
#include "../utils.h" #include "../../data_types/string_.h" #include <vector> #include <memory> class StringLengthVariance : public IntegerVariance { public: StringLengthVariance(std::shared_ptr<StringBase> obj, std::mt19937& rand); std::pair<int64_t, int64_t> get_limits(std::shared_ptr<StringBase> obj) override; int64_t get_value(std::shared_ptr<StringBase> obj); void perform_mutation(std::shared_ptr<StringBase> obj, int64_t value) override; bool supported(std::shared_ptr<StringBase> obj) override; static std::vector<std::shared_ptr<StringBase>> mutated_elements; }; #endif //MUTATOR_STRINGLENGTHVARIANCE_H这是头文件
最新发布
07-01
:perform_mutation(std::shared_ptr<StringBase> obj, int64_tvalue){//将字符串扩展到指定长度（这里假设expand函数已经定义在某个地方）obj->mutated_value= expand(obj->value,static_cast<size_t>(value));...
基于上面的代码，你重新将我的python代码转成cpp实现from data_types.string_ import String from mutators.utils import IntegerEdgeCases, expand class StringLengthEdgeCase(IntegerEdgeCases): mutated_elements = [] def __init__(self, obj, rand): super().__init__(obj, rand) def get_limits(self, obj): max_ = obj.mutator_config.max_output_size * 8 size = obj.calculate_bit_size() limit = max(max_ , size) limit = (limit + 7) // 8 max_ = limit if obj.max_length is not None: max_ = min(max_, obj.max_length) min_ = 0 if obj.min_length is not None: min_ = max(min_, obj.min_length) return min_, max_ @classmethod def supported(cls, obj): if isinstance(obj, String): return True return False def perform_mutation(self, obj, value): obj.mutated_value = expand(obj.value, value) obj.mutated = True
06-28
voidStringLengthEdgeCase::perform_mutation(std::shared_ptr<StringBase> obj, int64_tvalue){//使用expand函数扩展字符串obj->mutated_value =expand(obj->value, static_cast<size_t>(value));obj->mutated= ...
vue.runtime.esm.js:4625 [Vue warn]: Avoid mutating a prop directly since the value will be overwritten whenever the parent component re-renders. Instead, use a data or computed property based on the prop's value. Prop being mutated: "currentPage" found in ---> <BaseTablePage> at D:/fzh/vue工程/project(iSPS-S8100)/energycloud_iSPS-S8100/src/components/base/BaseTablePage.vue <Inverter> at D:/fzh/vue工程/project(iSPS-S8100)/energycloud_iSPS-S8100/src/views/system/inverter/Inverter.vue <Main> at D:/fzh/vue工程/project(iSPS-S8100)/energycloud_iSPS-S8100/src/views/system/main.vue <App> at D:/fzh/vue工程/project(iSPS-S8100)/energycloud_iSPS-S8100/src/App.vue <Root>为什么报错
04-01
这个警告的意思是你试图直接修改了一个来自父组件传递... <button @click="currentPageSync += 1">下一页</button> </template> ``` 以上两种方法都可以有效解决上述问题，并保证不会违反 Vue 单向数据流的设计理念。
NSArray或者NSMutableArray常见错误was mutated while being enumerated
vaercly的专栏
08-07 4503
在IOS开发中，我们经常用的NSArray或者NSMutableArray ,但是当使用不当的时候，会有下面的错误提示。 Collection was mutated while being enumerated. 遇到这类错误的时候，是同时对同一个数组进行了操作。 *这里说的是数组，其实别的类型的对象也出现这个问题，如：NSDictionary等* 下面一个简单的出现这类错误的用法：
was mutated while being enumerated.
工地菜鸟的博客
12-08 411
[self.qBgView.layer.sublayers enumerateObjectsUsingBlock:^(CALayer * _Nonnull obj, NSUInteger idx, BOOL * _Nonnull stop) { if ([obj isKindOfClass:[CAShapeLayer class]]) { [obj remov
*** Collection <__NSArrayM: 0x7f9fb3c48bc0> was mutated while being enumerated问题
developer_zhao的博客
02-26 1154
项目中遍历数组时老崩溃,最后成功解决,报这种错误其实就是遍历该数组的过程中修改了该数组.修改之后的代码为
【错误处理：】Collection <__NSArrayM: 0x12ec10e0> was mutated while being enumerated.
鹰击长空
10-15 6707
[cpp] view plaincopy *** Terminating app due to uncaught exception 'NSGenericException', reason: '*** Collection  was mutated while being enumerated.'   用个for循环去读取一个数组A，然后删除一些元素的操作
解决Collection <__NSArrayM: 0xb550c30> was mutated while being enumerated.-
a359798678的博客
06-03 885
bug: 今天做项目的时候遇到了这样一个崩溃信息: 解决Collection <__NSArrayM: 0xb550c30> was mutated while being enumerated.- 2017-06-22 16:45:42.229 ViewTest[2638:c07] *** Terminating app due to un...
was mutated while being enumerated. 解决方法
Logan_017的空间
06-21 4550
当程序出现这个提示的时候，是因为你一边便利数组，又同时修改这个数组里面的内容，导致崩溃，网上的方法如下： NSMutableArray * arrayTemp = xxx;   NSArray * array = [NSArray arrayWithArray: arrayTemp];   for (NSDictionary * dic in array) {
“*** Collection ＜__NSArrayM: 0x286a79ef0＞ was mutated while being enumerated.“
LiangYuan优快云的博客
11-28 907
错误信息： “*** Collection <__NSArrayM: 0x286a79ef0> was mutated while being enumerated.” 错误描述： 一边便利数组，又同时修改这个数组里面的内容，导致崩溃
【Bug-iOS】Collection <__NSArrayM: 0x> was mutated while being enumerated.
Wing_n的博客
10-09 899
NSMutableArray *mArr = [NSMutableArray array]; for (int i = 0; i < 10; i ++) {     NSMutableDictionary *mDic = [NSMutableDictionary dictionary];     [mDic setObject:[NSString stringWithFormat:@
was mutated while being enumerated
fellow_gengxj的博客
01-09 693
翻译: "在枚举的时候发生了变化" for...in...利用了快速枚举NSFastEnumerate，当我们想要改变数组变量中的数据或者删除数组中的数据的时候,不能用for...in... Objective-C中的foreach循环与Java中的类似，在内部是用iterator（迭代器）实现遍历的。而不管是在Java还是C++中，一旦修改了被遍历对象，在修改前生成的iterator都会失效
iPhone开发-- 崩溃之 Collection was mutated while being enumerated.的三种解决办法
zcl369369的专栏
02-14 1149
崩溃提示：Terminating app due to uncaught exception ‘NSGenericException’, reason: ‘*** Collection was mutated while being enumerated.’如果逻辑稍微有点复杂，为了防止死锁，还是用递归锁吧。原因就是在变量数组的时候，改变了数组的内容（或增或减数组中的元素）。再定义一个一模一样的数组B，将原数组的内容复制给数组B，再遍历数组B。
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