[問題] 自訂UIBarButtonItem

[HellCloud (Invisible)]

我試圖用Appearance去更改UIBarButtonItem的底圖

Code：
    UIImage *barButtonItem = [UIImage imageNamed:@"header-btn.png"];

    [[UIBarButtonItem appearance] setBackgroundImage:barButtonItem
    forState:UIControlStateNormal barMetrics:UIBarMetricsDefault];

    UIBarButtonItem *barBtn = [[UIBarButtonItem alloc] initWithImage:
    barButtonItem style:UIBarButtonItemStylePlain
    target:self.navigationController.parentViewController
    action:@selector(revealToggle:) ];

結果跑出來長這樣XD

http://i.imgur.com/hLJ71.png

請問我該怎麼樣讓他正常顯示呢..Orz

PS. header-btn.png 是 40x30的正常大小

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