UIBarButtonItem (系统 Item 样式)

最新推荐文章于 2019-04-09 09:53:00 发布

原创最新推荐文章于 2019-04-09 09:53:00 发布 · 965 阅读

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#Item #Item type #BarButtonItem

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本文介绍了在iOS应用开发中如何使用UIButtonBar系统的FlexibleSpace和FixedSpace进行灵活的UI布局，通过具体示例展示了如何创建自定义的UIToolbar，并设置了不同样式的UIBarButtonItem以实现自动居中效果。

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图示:

示例:

======图1： (UIBarButtonSystemItemFlexibleSpace)

//会根据item的高度自动居中，如果item中的btn不设置frame则不生效
    UIToolbar* tool = [[UIToolbar alloc]initWithFrame:CGRectMake(0, self.view.frame.size.height-55, self.view.frame.size.width, 55)];
    [self.view addSubview:tool];
    //半透明，模糊
    tool.barStyle = UIBarStyleBlackTranslucent;
    UIBarButtonItem* cancel = [[UIBarButtonItem alloc]initWithBarButtonSystemItem:UIBarButtonSystemItemFlexibleSpace target:self action:@selector(cancelCamera)];
    UIBarButtonItem* add = [[UIBarButtonItem alloc]initWithBarButtonSystemItem:UIBarButtonSystemItemSave target:self action:@selector(savePhoto)];
    UIBarButtonItem* add2 = [[UIBarButtonItem alloc]initWithBarButtonSystemItem:UIBarButtonSystemItemSave target:self action:@selector(savePhoto)];
    UIBarButtonItem* add3 = [[UIBarButtonItem alloc]initWithBarButtonSystemItem:UIBarButtonSystemItemSave target:self action:@selector(savePhoto)];
    [tool setItems:[NSArray arrayWithObjects:cancel,add,cancel,add2,cancel,add3,cancel, nil]];

=========图2 (UIBarButtonSystemItemFixedSpace)

//会根据item的高度自动居中，如果item中的btn不设置frame则不生效
    UIToolbar* tool = [[UIToolbar alloc]initWithFrame:CGRectMake(0, self.view.frame.size.height-55, self.view.frame.size.width, 55)];
    [self.view addSubview:tool];
    //半透明，模糊
    tool.barStyle = UIBarStyleBlackTranslucent;
    UIBarButtonItem* cancel = [[UIBarButtonItem alloc]initWithBarButtonSystemItem:UIBarButtonSystemItemFixedSpace target:self action:@selector(cancelCamera)];
    cancel.width = 20;

    UIBarButtonItem* add = [[UIBarButtonItem alloc]initWithBarButtonSystemItem:UIBarButtonSystemItemSave target:self action:@selector(savePhoto)];
    UIBarButtonItem* add2 = [[UIBarButtonItem alloc]initWithBarButtonSystemItem:UIBarButtonSystemItemSave target:self action:@selector(savePhoto)];
    UIBarButtonItem* add3 = [[UIBarButtonItem alloc]initWithBarButtonSystemItem:UIBarButtonSystemItemSave target:self action:@selector(savePhoto)];
    [tool setItems:[NSArray arrayWithObjects:cancel,add,cancel,add2,cancel,add3,cancel, nil]];

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