UIBarButtonItem不会显示

Question

为什么不显示？我试过模拟器5.1和6.0。最近发生了什么变化？

UIBarButtonItem* rightBarButtonItem = [[UIBarButtonItem alloc] initWithBarButtonSystemItem:UIBarButtonSystemItemPageCurl target:self action:@selector(openGasMileage)];

self.navigationItem.rightBarButtonItem = rightBarButtonItem;

Answer 1

由于＆gt; = ios5 sdk中不存在默认卷曲图像，您必须使用自己的图像：

- (UIBarButtonItem *) rightBarButtonItem {
    if (_rightBarButtonItem == nil) {
    UIButton *rightButton = [[UIButton alloc] initWithFrame:CGRectMake(0, 0, 50, 50)];
    [rightButton setImage:[UIImage imageNamed:@"edit.png"] forState:UIControlStateNormal];
    [rightButton addTarget:self action:@selector(own) forControlEvents:UIControlEventTouchUpInside];
    _rightBarButtonItem = [[UIBarButtonItem alloc] initWithCustomView:rightButton];
    }
return _rightBarButtonItem;
}

self.navigationItem.rightBarButtonItem = self.rightBarButtonItem;

另见：curl item