IOS Navigationbar Transparent

2. [Self.navigationController.navigationBar Settranslucent:yes];
4. Why add this, ShadowImage is only available after ios6.0. But found 5.0 can also be used. But if you don't judge if there's no such method,
6. And the direct go call may be crash, so judge under. Role: If you set the above sentence, you will find that it is transparent. But there will be a shadow in which the following method is going to shadow
8. if ([Self.navigationController.navigationBar respondstoselector: @selector (shadowImage)])
10. {
12. [Self.navigationController.navigationBar Setshadowimage:[[uiimage alloc] init]];
14. }
16. The above 4 sentences are necessary, but the habit is to add the following words
18. [Self.navigationController.navigationBar Setbackgroundcolor:clearcolor];

IOS Navigationbar Transparent