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NSTimeInterval duration = 3.0;
SEL selector = @selector(_setContentOffsetAnimationDuration:);
NSInvocation *invocation = [NSInvocation invocationWithMethodSignature:[scrollView methodSignatureForSelector:selector]];

[invocation setSelector:selector];
[invocation setTarget:scrollView];
[invocation setArgument:&duration atIndex:2];
[invocation invoke];

[scrollView setContentOffset:contentOffset animated:YES]