UINavigationController

　

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1.如何在Navigation上添加按钮 （如添加一个叉）

　 UIBarButtonItem *barButton = [[UIBarButtonItem alloc] initWithBarButtonSystemItem:UIBarButtonSystemItemStop target:self action:nil];

    barButton.tintColor = [UIColor purpleColor];

    self.navigationItem.leftBarButtonItem = barButton;