開關宏

#ifndef __OPTIMIZE__
#define OPEN_MEMORY_WARNING_TEST YES //打開內存警告測試開關
#endif

調用私有API

- (void)simulateMemoryWarning
{
    if (OPEN_MEMORY_WARNING_TEST == NO) {
        return;
    }
    [[UIApplication sharedApplication] _performMemoryWarning];
}

在需要的地方調用

[[MemoryWarningTest sharedInstance] simulateMemoryWarning];