UIBarButtonItem (系统 Item 样式)

  

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]];