SEL sel = NSSelectorFromString([@"_perform" stringByAppendingString:@"MemoryWarning"]); // Private API
assert([[UIApplication sharedApplication] respondsToSelector:sel]);
[[UIApplication sharedApplication] performSelector:sel];
SEL sel = NSSelectorFromString([@"_perform" stringByAppendingString:@"MemoryWarning"]); // Private API
assert([[UIApplication sharedApplication] respondsToSelector:sel]);
[[UIApplication sharedApplication] performSelector:sel];

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