自定义UINavigationBar backButton

Question

我总是设置backgroundImages的UINavigationBars，但我从来没有计算出如何设置UINavigationBar的后退按钮的backgroundImage。

我该怎么做？

Answer 1

我想你将不得不为backBarButtonItem创建一个自定义按钮，然后对其进行自定义。

如果你正在寻找教程，然后去这个问题 - How do you change color/image on the default backBarButtonItem?，我想你在那里找到你的答案。

要使条形按钮项目看起来像backBarButtonItem，请参阅此答案。 Creating a left-arrow button (like UINavigationBar's "back" style) on a UIToolbar

Answer 2

UIButton *button = [UIButton buttonWithType:UIButtonTypeCustom]; 
button.frame = CGRectMake(0,0,36,30); 
[button setBackgroundImage:[UIImage imageNamed:@"backgroundImage.png"] forState:UIControlStateNormal]; 

//[button setTitle:@" Back" forState:UIControlStateNormal]; 
//[button.titleLabel setFont:[UIFont boldSystemFontOfSize:11]]; 

[button addTarget:self.navigationController action:@selector(popViewControllerAnimated:) forControlEvents:UIControlEventTouchUpInside]; 
UIBarButtonItem *barButtonItem = [[UIBarButtonItem alloc] initWithCustomView:button]; 
[self.navigationItem setLeftBarButtonItem:barButtonItem]; 

Answer 3

UIButton *backbutton = [UIButton buttonWithType:UIButtonTypeCustom]; 
backbutton.frame = CGRectMake(0,0,36,30); 
[backbutton setBackgroundImage:[UIImage imageNamed:@"backgroundImage.png"] forState:UIControlStateNormal]; 

[backbutton addTarget:self.navigationController action:@selector(popViewControllerAnimated:) forControlEvents:UIControlEventTouchUpInside]; 
UIBarButtonItem *barButtonItem = [[UIBarButtonItem alloc] initWithCustomView:backbutton]; 
[self.navigationItem setLeftBarButtonItem:barButtonItem];