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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;
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原文地址:http://www.cnblogs.com/puppyb2m/p/4758991.html