背景描述

#import "TMUStoreMemoryDataCache.h"
static TMUStoreMemoryDataCache * _instance = nil;

@implementation TMUStoreMemoryDataCache

+ (instancetype)shareInstance{
    //static TMUStoreMemoryDataCache * instance = nil;
    static dispatch_once_t onceToken;
    dispatch_once(&onceToken, ^{
        _instance = [[TMUStoreMemoryDataCache alloc]init];
    });
    return _instance;
}

我在一下代码中创建的单例，使用全局的static _instacce，就会出现以下错误，这个断点即使不打开All Exceptions`也会出现。后来我将上面全局的变量改成局部的，就不在出错。问题原因尚未找到

Execution was interrupted, reason: EXC_BREAKPOINT (code=1, subcode=0x101c2f740). The process has been returned to the state before expression evaluation.

解决

将全局_instace换成局部的instace，就能解决

原因

还未找到具体原因