NSURLSession对他的代理是一个强引用
Important
The session object keeps a strong reference to the delegate
until your app exits or explicitly invalidates the session.
If you do not invalidate the session,
your app leaks memory until it exits.
NSURLSession对他的代理是一个强引用
Important
The session object keeps a strong reference to the delegate
until your app exits or explicitly invalidates the session.
If you do not invalidate the session,
your app leaks memory until it exits.
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