[btn.widthAnchor constraintEqualToConstant:25].active = YES;
[btn.heightAnchor constraintEqualToConstant:25].active = YES;
UIBarButtonItem *item = [[UIBarButtonItem alloc] initWithCustomView:btn];
[items addObject:item];
self.navigationItem.leftBarButtonItems = items;
模态跳转
QDCAddressBookViewController *vcer = [[QDCAddressBookViewController alloc] init]; UINavigationController *nav = [[UINavigationController alloc] initWithRootViewController:vcer]; nav.modalPresentationStyle = UIModalPresentationFullScreen;
[selfpresentViewController:nav animated:YEScompletion:nil];
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