关于xcode：将自定义按钮添加到没有边框的导航控制器

Add custom button to navigation controller without border

我将自定义按钮添加到导航控制器

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UIBarButtonItem *backButton = [[UIBarButtonItem alloc] initWithImage:[UIImage imageNamed:@"back.png"]
style:UIBarButtonItemStylePlain
target:self
action:@selector(backAction)];
self.navigationItem.leftBarButtonItem = backButton;

它工作正常，但按钮似乎有边框。我怎样才能解决这个问题？

更新我找到了解决办法

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UIButton *button = [[UIButton alloc] initWithFrame:CGRectMake(0, 0, 25, 25)];
[button setImage:[UIImage imageNamed:@"back.png"] forState:UIControlStateNormal];
[button addTarget:self action:@selector(buttonFavoriteClicked) forControlEvents:UIControlEventTouchUpInside];
UIBarButtonItem *back = [[UIBarButtonItem alloc] initWithCustomView:button];
[button release];

1	self.navigationItem.leftBarButtonItem = back;

试试这个。

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UIButton *backButton = [[UIButton alloc] initWithFrame:CGRectMake(0, 0, button_width, button_height)];
[backButton setImage:[UIImage imageNamed:@"back.png"] forState:UIControlStateNormal];
[backButton addTarget:self action:@selector(backAction) forControlEvents:UIControlEventTouchUpInside];
self.navigationItem.leftBarButtonItem = [[UIBarButtonItem alloc] initWithCustomView:backButton];

斯威夫特4

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let backButton = UIButton(frame: CGRect(x: 0, y: 0, width: 25, height: 25))
backButton.setImage(UIImage(named:"back.png"), for: .normal)
backButton.addTarget(self, action: #selector(backAction), for: .touchUpInside)
self.navigationItem.rightBarButtonItem = UIBarButtonItem(customView: backButton)

操作(选择器)应该如下所示：

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@objc func backAction () {
// do the magic
}