[英]How to change the font color / Text Color of the UIBarButtonItem on navigation bar
我以编程方式向导航栏添加一个栏按钮,如下所示
UIBarButtonItem *cancel = [[UIBarButtonItem alloc] initWithTitle:@"CANCEL" style:UIBarButtonItemStyleBordered target:self action:@selector(goToPreviousView)];
self.navigationItem.leftBarButtonItem = cancel;
现在我想以RED Color显示文本“CANCEL” 。
我的意思是我需要更改栏按钮项目上的文本,而不是按钮的色调。
怎么做?
看一下这个 :-
UIBarButtonItem *cancel = [[UIBarButtonItem alloc] initWithTitle:@"Title" style:UIBarButtonItemStyleBordered target:nil action:nil];
[cancel setTitleTextAttributes:[NSDictionary dictionaryWithObjectsAndKeys: [UIColor redColor], UITextAttributeTextColor,nil] forState:UIControlStateNormal];
只是一个带有现代 Obj-C 语法的 iOS7 更新:
[barButtonItem setTitleTextAttributes:@{NSForegroundColorAttributeName:[UIColor redColor]} forState:UIControlStateNormal];
UITextAttributeTextColor //Is deprecated on iOS 7.
此代码用于从外观代理更改文本颜色。
[[UIBarButtonItem appearance] setTintColor:[UIColor redColor]];
这是更新的 swift 4.0 版本代码:
let reset = UIBarButtonItem(title: "Reset All", style: .plain , target: self, action: #selector(self.resetButtonClicked(_ :) ))
reset.setTitleTextAttributes([NSAttributedStringKey.foregroundColor: UIColor.red], for: .normal)
另一种方法是:-
UIButton *button = [UIButton buttonWithType:UIButtonTypeCustom];
[button setBackgroundImage:[UIImage imageNamed:@"delete.png"] forState:UIControlStateNormal];
[button setTitle:@"Delete" forState:UIControlStateNormal];
button.titleLabel.font = [UIFont fontWithName:@"Helvetica-Bold" size:12.0f];
[button.layer setCornerRadius:4.0f];
[button.layer setMasksToBounds:YES];
[button.layer setBorderWidth:1.0f];
[button.layer setBorderColor: [[UIColor grayColor] CGColor]];
button.frame=CGRectMake(0.0, 100.0, 60.0, 30.0);
[button addTarget:self action:@selector(batchDelete) forControlEvents:UIControlEventTouchUpInside];
UIBarButtonItem* deleteItem = [[UIBarButtonItem alloc] initWithCustomView:button];
此代码用于更改导航栏上 UIBarButtonItem 的文本颜色:
UILabel *lblTotCaratteri = [[UILabel alloc] initWithFrame:CGRectMake(0, 0, 50, 25)];
lblTotCaratteri.textAlignment = UITextAlignmentCenter;
lblTotCaratteri.font = [UIFont italicSystemFontOfSize:13.0];
lblTotCaratteri.textColor = [UIColor redColor];
lblTotCaratteri.backgroundColor = [UIColor clearColor];
lblTotCaratteri.adjustsFontSizeToFitWidth = YES;
lblTotCaratteri.text = @"Cancel";
UIBarButtonItem *lblCaratteri = [[UIBarButtonItem alloc] initWithCustomView: lblTotCaratteri];
self.navigationItem.rightBarButtonItem = lblCaratteri;
老问题,这是 swift 2.2 解决方案:
let cancel = UIBarButtonItem(title: "CANCEL", style: .Bordered, target: self, action: #selector(goToPreviousView))
cancel.setTitleTextAttributes([NSForegroundColorAttributeName: UIColor.redColor()], forState: .Normal)
self.navigationItem.leftBarButtonItem = cancel
斯威夫特 4.2
let doneButton = UIBarButtonItem(title: "Done", style: .plain, target: self, action: nil)
doneButton.setTitleTextAttributes([.foregroundColor: UIColor.red], for: .normal)
UIBarButtonItem 使用属性文本:
func createCancelButton() {
guard let font = UIFont(name: "OpenSans", size: 12) else { return }
let cancelButton = UIBarButtonItem(title: "Logout", style: .plain, target: self, action: #selector(cancelTapped))
cancelButton.setTitleTextAttributes([NSAttributedString.Key.foregroundColor : UIColor.blue, NSAttributedString.Key.font : font], for: .normal)
navigationItem.leftBarButtonItem = cancelButton
}
@objc func cancelTapped() {
print("cancelTapped")
}
UIBarButtonItem 使用纯文本:
func createCancelButton() {
let cancelButton = UIBarButtonItem(title: "Logout", style: .plain, target: self, action: #selector(cancelTapped))
cancelButton.tintColor = UIColor.blue
navigationItem.leftBarButtonItem = cancelButton
}
@objc func cancelTapped() {
print("cancelTapped")
}
UITextAttributeTextColor //在 iOS 7 上已弃用。
像这样设置 BarButtonItem 的颜色
[_barButtonItem setTitleTextAttributes:
[NSDictionary dictionaryWithObjectsAndKeys:
[UIColor colorWithRed:250/255.0
green:240/255.0
blue:230/255.0
alpha:1.0],
NSForegroundColorAttributeName,nil]
forState:UIControlStateNormal];
如果您需要设置不同于默认外观的颜色,请使用:
barButtonItem.tintColor = .red
如果它不是您的项目并且您只需要添加一些更改,那么每个人都应该做的主要事情是检查
[UIBarButtonItem appearance]
我浪费了很多时间才意识到有人设置了错误的 UIBarButtonItem 外观
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