Ignored control UIToolbar, ignoring control UIToolbar

Ignored control UIToolbar, ignoring control UIToolbar
Preface

UIToolbar has been used before, but it is not easy to use. Over time, I forgot his existence. Today I saw it when I looked at other people's source code. How is it very convenient, when we arrange a row of views, we can easily make the layout out without calculating the coordinates in it.

Code

UIToolbar * tool = [[UIToolbar alloc] initWithFrame: CGRectMake (0,100,300, 50)]; tool. layer. borderWidth = 1; tool. barStyle = UIBarStyleBlack; tool. backgroundColor = [UIColor blackColor]; [self. view addSubview: tool]; // UIBarButtonItem * space = [[UIBarButtonItem alloc] initWithBarButtonSystemItem: UIBarButtonSystemItemFlexibleSpace target: nil action: NULL]; optional * previusitem = [[UIBarButtonItem alloc] initWithImage: [[UIImage imageNamed: @ "player_pause"] imageWithRenderingMode: Success] style: adjust target: self action: @ selector (previous :)]; optional * previusitem1 = [[UIBarButtonItem alloc] initWithImage: [[UIImage imageNamed: @ "player_pause"] imageWithRenderingMode: Custom] style: Custom target: self action: @ selector (previous :)] UISlider * slider = [UISlider alloc] initWithFrame: CGRectMake (0, 0,150, 20)]; UIBarButtonItem * volumnItem = [[UIBarButtonItem alloc] usage: slider]; tool. items = @ [space, previusitem1, space, volumnItem, space, previusitem];