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I make a new project by xcode 10,then I run a Instrument memory leak test for this in a iPhone 8 Plus(iOS 12.2) directly.About 1 minute later,the Instrument shows some memory leaks.But when I run the same project on a iPhone 4s(iOS 9.3.5),the memory was no leak at all.I am confuse with that situation,I want to know how can I fix this problem??