*** Collection <__NSArrayM: 0x7f9fb3c48bc0> was mutated while being enumerated问题

最新推荐文章于 2020-06-10 13:54:38 发布
原创 最新推荐文章于 2020-06-10 13:54:38 发布 · 1.1k 阅读 · 0 ·
CC 4.0 BY-SA版权
版权声明：本文为博主原创文章，遵循 CC 4.0 BY-SA 版权协议，转载请附上原文出处链接和本声明。

本文介绍了一种在项目中遇到的遍历数组时程序崩溃的问题，并给出了最终的解决方案。问题出现的原因是在遍历过程中对数组进行了修改。
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
was mutated while being enumerated.-terminate called throwing&nbsp
836811384
06-04 167
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...
奔溃日志：was mutated while being enumerated
weixin_30381793的博客
02-22 195
这两天发现app的一个崩溃，提示是 *** Collection <CALayerArray: 0x18904630> was mutated while being enumerated. 找了一天终于找到了罪魁祸首，代码是这样的 for (NSInteger i = 0; i < postArr.count; i++) { ...
was mutated while being enumerated
u013430241的博客
08-08 508
在oc中会出现这种情况，当时不知道怎么回事，就一直查代码，因为以前写的就没有问题，为什么这次就出现问题了。- (void)deleteContactsForName:(NSString *)name{ for (NSString * groupName in _contactDic) { NSMutableArray * oneGroup =[_contactDic obje
// // Created by k50048780 on 25-6-25. // #include "StringFormatRandom.h" #include "../../data_types/string_.h" #include <random> #include <algorithm> const std::vector<std::string> StringFormatRandom::formatStrings = { "%s%-lc%d%#f%a%+i%@%s%-lc%d%#f%a%+i%@%s%-lc%d%#f%a%", "%s%s%s%s", "%n%x%d", "%s%d%u%x!@#$%&*()\t\r\n-=%s%d%u%x!@#$%&*()\t\r\n-=%s%d%u%x!@#$%", "%0.0d", "%*$c", "%#0123456x%08x%x%s%p%d%n%o%u%c%h%l%q%j%z%Z%t%i%e%g%f%a%C%S%08x%%", "%d%d%d%d", "%r%s%-d%f%i", "%u%d%-i%x%b", "%c%o%-E%e%g%s", "%G%s%-d%r%u%f", }; StringFormatRandom::StringFormatRandom(std::shared_ptr<StringBase> obj, std::mt19937& rand) : StringMutator(obj, rand), randEngine(rand) {} std::int64_t StringFormatRandom::get_count() { return formatStrings.size(); } bool StringFormatRandom::supported(std::shared_ptr<StringBase> obj) { return (std::dynamic_pointer_cast<StringBase>(obj) != nullptr); } void StringFormatRandom::perform_mutation(std::shared_ptr<StringBase> obj, std::int64_t index) { if (index < formatStrings.size()) { // 将选中的格式字符串作为新的变异值 obj->mutated_value = std::vector<uint8_t>(formatStrings[index].begin(), formatStrings[index].end()); } } int StringFormatRandom::get_cur_mutation_idx() { int index = cur_mutation_idx++; if (cur_mutation_idx >= static_cast<int>(formatStrings.size())) { cur_mutation_idx = 0; } return index; } void StringFormatRandom::sequential_mutation(std::shared_ptr<StringBase> obj) { auto stringObj = std::dynamic_pointer_cast<StringBase>(obj); if (stringObj) { perform_mutation(stringObj, get_cur_mutation_idx()); stringObj->mutated = true; } } void StringFormatRandom::random_mutation(std::shared_ptr<StringBase> obj) { auto stringObj = std::dynamic_pointer_cast<StringBase>(obj); if (stringObj) { // 生成随机索引 [0, size-1] std::uniform_int_distribution<size_t> dist(0, formatStrings.size() - 1); size_t randomIndex = dist(randEngine); perform_mutation(stringObj, randomIndex); stringObj->mutated = true; } } 报错/data/k50048780/cpp_mutator2/mutators/string/StringFormatRandom.cpp: In member function ‘virtual void StringFormatRandom::perform_mutation(std::shared_ptr<StringBase>, int64_t)’: /data/k50048780/cpp_mutator2/mutators/string/StringFormatRandom.cpp:40:107: error: no match for ‘operator=’ (operand types are ‘std::__cxx11::basic_string<char>’ and ‘std::vector<unsigned char>’) 40 | 8_t>(formatStrings[index].begin(), formatStrings[index].end()); | ^ In file included from /data/taoli/c_compiler/gcc-9.5.0/include/c++/9.5.0/string:55, from /data/taoli/c_compiler/gcc-9.5.0/include/c++/9.5.0/random:40, from /data/k50048780/cpp_mutator2/mutators/string/../../utils/sample_util.h:9, from /data/k50048780/cpp_mutator2/mutators/string/StringFormatRandom.h:8, from /data/k50048780/cpp_mutator2/mutators/string/StringFormatRandom.cpp:5: /data/taoli/c_compiler/gcc-9.5.0/include/c++/9.5.0/bits/basic_string.h:674:7: note: candidate: ‘std::__cxx11::basic_string<_CharT, _Traits, _Alloc>& std::__cxx11::basic_string<_CharT, _Traits, _Alloc>::operator=(const std::__cxx11::basic_string<_CharT, _Traits, _Alloc>&) [with _CharT = char; _Traits = std::char_traits<char>; _Alloc = std::allocator<char>]’ 674 | operator=(const basic_string& __str) | ^~~~~~~~ /data/taoli/c_compiler/gcc-9.5.0/include/c++/9.5.0/bits/basic_string.h:674:37: note: no known conversion for argument 1 from ‘std::vector<unsigned char>’ to ‘const std::__cxx11::basic_string<char>&’ 674 | operator=(const basic_string& __str) | ~~~~~~~~~~~~~~~~~~~~^~~~~ /data/taoli/c_compiler/gcc-9.5.0/include/c++/9.5.0/bits/basic_string.h:713:7: note: candidate: ‘std::__cxx11::basic_string<_CharT, _Traits, _Alloc>& std::__cxx11::basic_string<_CharT, _Traits, _Alloc>::operator=(const _CharT*) [with _CharT = char; _Traits = std::char_traits<char>; _Alloc = std::allocator<char>]’ 713 | operator=(const _CharT* __s) | ^~~~~~~~ /data/taoli/c_compiler/gcc-9.5.0/include/c++/9.5.0/bits/basic_string.h:713:31: note: no known conversion for argument 1 from ‘std::vector<unsigned char>’ to ‘const char*’ 713 | operator=(const _CharT* __s) | ~~~~~~~~~~~~~~^~~ /data/taoli/c_compiler/gcc-9.5.0/include/c++/9.5.0/bits/basic_string.h:724:7: note: candidate: ‘std::__cxx11::basic_string<_CharT, _Traits, _Alloc>& std::__cxx11::basic_string<_CharT, _Traits, _Alloc>::operator=(_CharT) [with _CharT = char; _Traits = std::char_traits<char>; _Alloc = std::allocator<char>]’ 724 | operator=(_CharT __c) | ^~~~~~~~ /data/taoli/c_compiler/gcc-9.5.0/include/c++/9.5.0/bits/basic_string.h:724:24: note: no known conversion for argument 1 from ‘std::vector<unsigned char>’ to ‘char’ 724 | operator=(_CharT __c) | ~~~~~~~^~~ /data/taoli/c_compiler/gcc-9.5.0/include/c++/9.5.0/bits/basic_string.h:741:7: note: candidate: ‘std::__cxx11::basic_string<_CharT, _Traits, _Alloc>& std::__cxx11::basic_string<_CharT, _Traits, _Alloc>::operator=(std::__cxx11::basic_string<_CharT, _Traits, _Alloc>&&) [with _CharT = char; _Traits = std::char_traits<char>; _Alloc = std::allocator<char>]’ 741 | operator=(basic_string&& __str) | ^~~~~~~~ /data/taoli/c_compiler/gcc-9.5.0/include/c++/9.5.0/bits/basic_string.h:741:32: note: no known conversion for argument 1 from ‘std::vector<unsigned char>’ to ‘std::__cxx11::basic_string<char>&&’ 741 | operator=(basic_string&& __str) | ~~~~~~~~~~~~~~~^~~~~ /data/taoli/c_compiler/gcc-9.5.0/include/c++/9.5.0/bits/basic_string.h:804:7: note: candidate: ‘std::__cxx11::basic_string<_CharT, _Traits, _Alloc>& std::__cxx11::basic_string<_CharT, _Traits, _Alloc>::operator=(std::initializer_list<_Tp>) [with _CharT = char; _Traits = std::char_traits<char>; _Alloc = std::allocator<char>]’ 804 | operator=(initializer_list<_CharT> __l) | ^~~~~~~~ /data/taoli/c_compiler/gcc-9.5.0/include/c++/9.5.0/bits/basic_string.h:804:42: note: no known conversion for argument 1 from ‘std::vector<unsigned char>’ to ‘std::initializer_list<char>’ 804 | operator=(initializer_list<_CharT> __l) | ~~~~~~~~~~~~~~~~~~~~~~~~~^~~ /data/taoli/c_compiler/gcc-9.5.0/include/c++/9.5.0/bits/basic_string.h:818:8: note: candidate: ‘template<class _Tp> std::__cxx11::basic_string<_CharT, _Traits, _Alloc>::_If_sv<_Tp, std::__cxx11::basic_string<_CharT, _Traits, _Alloc>&> std::__cxx11::basic_string<_CharT, _Traits, _Alloc>::operator=(const _Tp&) [with _Tp = _Tp; _CharT = char; _Traits = std::char_traits<char>; _Alloc = std::allocator<char>]’ 818 | operator=(const _Tp& __svt) | ^~~~~~~~ /data/taoli/c_compiler/gcc-9.5.0/include/c++/9.5.0/bits/basic_string.h:818:8: note: template argument deduction/substitution failed: In file included from /data/taoli/c_compiler/gcc-9.5.0/include/c++/9.5.0/bits/move.h:55, from /data/taoli/c_compiler/gcc-9.5.0/include/c++/9.5.0/bits/stl_pair.h:59, from /data/taoli/c_compiler/gcc-9.5.0/include/c++/9.5.0/bits/stl_algobase.h:64, from /data/taoli/c_compiler/gcc-9.5.0/include/c++/9.5.0/vector:60, from /data/k50048780/cpp_mutator2/mutators/string/../../utils/sample_util.h:8, from /data/k50048780/cpp_mutator2/mutators/string/StringFormatRandom.h:8, from /data/k50048780/cpp_mutator2/mutators/string/StringFormatRandom.cpp:5: /data/taoli/c_compiler/gcc-9.5.0/include/c++/9.5.0/type_traits: In substitution of ‘template<bool _Cond, class _Tp> using enable_if_t = typename std::enable_if::type [with bool _Cond = std::integral_constant<bool, false>::value; _Tp = std::__cxx11::basic_string<char>&]’: /data/taoli/c_compiler/gcc-9.5.0/include/c++/9.5.0/bits/basic_string.h:121:8: required by substitution of ‘template<class _CharT, class _Traits, class _Alloc> template<class _Tp, class _Res> using _If_sv = std::enable_if_t<std::__and_<std::is_convertible<const _Tp&, std::basic_string_view<_CharT, _Traits> >, std::__not_<std::is_convertible<const _Tp*, const std::__cxx11::basic_string<_CharT, _Traits, _Alloc>*> >, std::__not_<std::is_convertible<const _Tp&, const _CharT*> > >::value, _Res> [with _Tp = std::vector<unsigned char>; _Res = std::__cxx11::basic_string<char>&; _CharT = char; _Traits = std::char_traits<char>; _Alloc = std::allocator<char>]’ /data/taoli/c_compiler/gcc-9.5.0/include/c++/9.5.0/bits/basic_string.h:818:8: required by substitution of ‘template<class _Tp> std::__cxx11::basic_string<char>::_If_sv<_Tp, std::__cxx11::basic_string<char>&> std::__cxx11::basic_string<char>::operator=<_Tp>(const _Tp&) [with _Tp = std::vector<unsigned char>]’ /data/k50048780/cpp_mutator2/mutators/string/StringFormatRandom.cpp:40:107: required from here /data/taoli/c_compiler/gcc-9.5.0/include/c++/9.5.0/type_traits:2378:11: error: no type named ‘type’ in ‘struct std::enable_if<false, std::__cxx11::basic_string<char>&>’ 2378 | using enable_if_t = typename enable_if<_Cond, _Tp>::type; | ^~~~~~~~~~~
07-01
报错信息表明你在尝试将一个 `std::vector<uint8_t>` 赋值给一个 `std::string` 类型的成员变量（应该是 `obj->mutated_value`），但两者类型不匹配。 --- ### **错误分析** 从报错行： ```cpp obj->mutated_...
if mutated_count == 1: char_encoded_array.append(code_point) elif mutated_count == 2: char_encoded_array.append(0xC0 | (code_point >> 6)) char_encoded_array.append(0x80 | (code_point >> 0x3F)) elif mutated_count == 3: char_encoded_array.append(0xE0 | (code_point >> 12)) char_encoded_array.append(0x80 | ((code_point >> 6) & 0x3F)) char_encoded_array.append(0x80 | (code_point & 0x3F)) elif mutated_count == 4: char_encoded_array.append(0xF0 | (code_point >> 18)) char_encoded_array.append(0x80 | ((code_point >> 12) & 0x3F)) char_encoded_array.append(0x80 | ((code_point >> 6) & 0x3F)) char_encoded_array.append(0x80 | (code_point & 0x3F)) elif mutated_count == 5: char_encoded_array.append(0xF8 | (code_point >> 24)) char_encoded_array.append(0x80 | ((code_point >> 18) & 0x3F)) char_encoded_array.append(0x80 | ((code_point >> 12) & 0x3F)) char_encoded_array.append(0x80 | ((code_point >> 6) & 0x3F)) char_encoded_array.append(0x80 | (code_point & 0x3F)) elif mutated_count == 6: char_encoded_array.append(0xFC | (code_point >> 30)) char_encoded_array.append(0x80 | ((code_point >> 24) & 0x3F)) char_encoded_array.append(0x80 | ((code_point >> 18) & 0x3F)) char_encoded_array.append(0x80 | ((code_point >> 12) & 0x3F)) char_encoded_array.append(0x80 | ((code_point >> 6) & 0x3F)) char_encoded_array.append(0x80 | (code_point & 0x3F)) else: raise ValueError("Unsupported value")这对吗
最新发布
07-15
char_encoded_array.append(0xE0 | ((code_point >> 12) & 0x0F)) char_encoded_array.append(0x80 | ((code_point >> 6) & 0x3F)) char_encoded_array.append(0x80 | (code_point & 0x3F)) elif mutated_count =...
#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
<think>我们遇到了一个C++编译错误，错误发生在StringLengthVariance.cpp文件中。错误信息表明在get_limits函数中，我们尝试访问obj->max_length和obj->min_length的成员（如has_value和value），但是编译器认为这些...
std::vector<uint32_t> StringUtf8ExtraBytes::encode_string(std::string& input, std::vector<int>& indices, int seed = 0) { std::default_random_engine rand_engine(seed); std::uniform_int_distribution<int> dist(0); std::vector<uint32_t> result; for (size_t i = 0; i < input.size(); ++i) { char32_t ch = input[i]; uint32_t code_point = static_cast<uint32_t>(ch); int byte_count = ENCODE::get_byte_count(code_point); int mutated_count = byte_count; std::vector<uint32_t > encoded; bool selected_mutate = false; for (int idx : indices) { if (static_cast<size_t>(idx) == i + 1) { selected_mutate = true; break; } } if (selected_mutate) { std::uniform_int_distribution<int> mutation_dist(byte_count + 1, 6); mutated_count = mutation_dist(rand_engine); } switch (mutated_count) { case 1: encoded.push_back(static_cast<uint8_t>(code_point)); break; case 2: encoded.push_back(0xC0 | ((code_point >> 6) & 0x1F)); encoded.push_back(0x80 | (code_point & 0x3F)); break; case 3: encoded.push_back(0xE0 | ((code_point >> 12) & 0x0F)); encoded.push_back(0x80 | ((code_point >> 6) & 0x3F)); encoded.push_back(0x80 | (code_point & 0x3F)); break; case 4: encoded.push_back(0xF0 | ((code_point >> 18) & 0x07)); encoded.push_back(0x80 | ((code_point >> 12) & 0x3F)); encoded.push_back(0x80 | ((code_point >> 6) & 0x3F)); encoded.push_back(0x80 | (code_point & 0x3F)); break; case 5: encoded.push_back(0xF8 | ((code_point >> 24) & 0x03)); encoded.push_back(0x80 | ((code_point >> 18) & 0x3F)); encoded.push_back(0x80 | ((code_point >> 12) & 0x3F)); encoded.push_back(0x80 | ((code_point >> 6) & 0x3F)); encoded.push_back(0x80 | (code_point & 0x3F)); break; case 6: encoded.push_back(0xFC | ((code_point >> 30) & 0x01)); encoded.push_back(0x80 | ((code_point >> 24) & 0x3F)); encoded.push_back(0x80 | ((code_point >> 18) & 0x3F)); encoded.push_back(0x80 | ((code_point >> 12) & 0x3F)); encoded.push_back(0x80 | ((code_point >> 6) & 0x3F)); encoded.push_back(0x80 | (code_point & 0x3F)); break; default: throw std::runtime_error("Unsupported value"); } result.insert(result.end(), encoded.begin(), encoded.end()); } return result; }转化为返回值是uint8_t安全吗
07-04
你的问题非常关键，我们来逐层分析这段代码，并回答你提出的： > 将返回值 `std::vector<uint32_t>` 改为 `std::vector<uint8_t>` 是否安全？ --- ## 一、函数逻辑概览 这个函数 `encode_string` 的作用是： - ...
was mutated while being enumerated.
工地菜鸟的博客
12-08 444
[self.qBgView.layer.sublayers enumerateObjectsUsingBlock:^(CALayer * _Nonnull obj, NSUInteger idx, BOOL * _Nonnull stop) { if ([obj isKindOfClass:[CAShapeLayer class]]) { [obj remov
nsarray was mutated while being enumerated
晓鱼儿的专栏
08-10 1139
在遍历数组过程中，找到要删除的元素并删除的时候会报错
iOS之解决崩溃Collection was mutated while being enumerated.
feelinghappy的专栏
06-10 2076
崩溃提示：Terminating app due to uncaught exception 'NSGenericException', reason: '*** Collection <CALayerArray: 0x14df0bd0> was mutated while being enumerated.' 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; ...
iOS_报错"Collection NSArrayM was mutated while being enumerated"
jacob_ios的博客
02-28 1882
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...
【转】was mutated while being enumerated 你是不是以为你真的懂For...in... ??
weixin_33937499的博客
05-29 209
原文网址：http://www.jianshu.com/p/ad80d9443a92 支持原创,如需转载, 请注明出处你是不是以为你真的懂For...in... ??哈哈哈哈, 我也碰到了这个报错 .究其原因, 顾名思义 "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....
Bug-iOS: Collection <__NSArrayM: 0x> was mutated while being enumerated.
热门推荐
欧阳天涵的专栏
10-29 1万+
//init a NSArray NSMutableArray *arr2 = [NSMutableArray array]; for (int i=0; i<10; ++i) { NSMutableDictionary *d = [NSMutableDictionary dictionaryWithObjectsAndKeys:[NSStr
Collection <__NSArrayM: 0xxxxxxx> was mutated while being enumerated.
u011270282的专栏
05-12 750
在遍历时，又操作NSArray或者NSMutableArray，会出现这个错误。 NSMutableArray * array = xxx;   for (NSDictionary * dic in array) {       [array removeObject:dic]; } 改为如下即可： NSMutableArray
Collection NSArrayM was mutated while being enumerated
gaoyp的专栏
05-17 558
NSMutableArray* arrMutable = [NSMutableArray array];     //不能在枚举可变数组的同时增删其项目，下面的作法会报错。     for(AClass* item in arrMutable){         BOOL needRemove = YES;         if(needRemove){             [arr
解决 Crash:Collection <__NSArrayM: 0x61000024df50> was mutated while being enumerated
u012186949的专栏
05-23 5002
当你对一个可变数组（ NSMutabeArray）进行枚举的同时
__NSArrayM: 0xb550c30> was mutated while being enumerated.-
dingqk的博客
11-02 1996
错误信息reason: '*** Collection <__NSArrayM: 0xb550c30> was mutated while being enumerated.'当程序出现这个提示的时候，是因为你在遍历数组的时候修改了数组中的元素导致崩溃的，如下： NSMutablerray * array = [NSMutablerray array]; for (NSString
评论
添加红包

请填写红包祝福语或标题

个

红包个数最小为10个

元

红包金额最低5元

当前余额3.43元 前往充值 >
需支付：10.00元
成就一亿技术人!
领取后你会自动成为博主和红包主的粉丝 规则
hope_wisdom
发出的红包
实付元
使用余额支付
点击重新获取
扫码支付
钱包余额 0

抵扣说明：

1.余额是钱包充值的虚拟货币，按照1:1的比例进行支付金额的抵扣。
2.余额无法直接购买下载，可以购买VIP、付费专栏及课程。

余额充值