UIAlertController自定义字体、大小、颜色
UIAlertController自定义字体、大小、颜色
提问于 2014-10-20 15:45:11
我正在使用新的UIAlertController来显示警报。我有这样的代码：
// nil titles break alert interface on iOS 8.0, so we'll be using empty strings
UIAlertController *alert = [UIAlertController alertControllerWithTitle: title == nil ? @"": title message: message preferredStyle: UIAlertControllerStyleAlert];
UIAlertAction *defaultAction = [UIAlertAction actionWithTitle: cancelButtonTitle style: UIAlertActionStyleCancel handler: nil];
[alert addAction: defaultAction];
UIViewController *rootViewController = [UIApplication sharedApplication].keyWindow.rootViewController;
[rootViewController presentViewController:alert animated:YES completion:nil];现在我想更改标题和消息的字体、颜色、大小等。做这件事最好的方法是什么？
编辑：我应该插入整个代码。我为UIView创建了一个类别，我可以为iOS版本显示正确的警报。
@implementation UIView (AlertCompatibility)
+( void )showSimpleAlertWithTitle:( NSString * )title
message:( NSString * )message
cancelButtonTitle:( NSString * )cancelButtonTitle
{
float iOSVersion = [[UIDevice currentDevice].systemVersion floatValue];
if (iOSVersion < 8.0f)
{
UIAlertView *alert = [[UIAlertView alloc] initWithTitle: title
message: message
delegate: nil
cancelButtonTitle: cancelButtonTitle
otherButtonTitles: nil];
[alert show];
}
else
{
// nil titles break alert interface on iOS 8.0, so we'll be using empty strings
UIAlertController *alert = [UIAlertController alertControllerWithTitle: title == nil ? @"": title
message: message
preferredStyle: UIAlertControllerStyleAlert];
UIAlertAction *defaultAction = [UIAlertAction actionWithTitle: cancelButtonTitle
style: UIAlertActionStyleCancel
handler: nil];
[alert addAction: defaultAction];
UIViewController *rootViewController = [UIApplication sharedApplication].keyWindow.rootViewController;
[rootViewController presentViewController:alert animated:YES completion:nil];
}
}回答 25
Stack Overflow用户
发布于 2014-10-23 22:34:51
我不确定这是否违反了私有API/属性，但我在ios8上使用KVC是可行的
UIAlertController *alertVC = [UIAlertController alertControllerWithTitle:@"Dont care what goes here, since we're about to change below" message:@"" preferredStyle:UIAlertControllerStyleActionSheet];
NSMutableAttributedString *hogan = [[NSMutableAttributedString alloc] initWithString:@"Presenting the great... Hulk Hogan!"];
[hogan addAttribute:NSFontAttributeName
value:[UIFont systemFontOfSize:50.0]
range:NSMakeRange(24, 11)];
[alertVC setValue:hogan forKey:@"attributedTitle"];
UIAlertAction *button = [UIAlertAction actionWithTitle:@"Label text"
style:UIAlertActionStyleDefault
handler:^(UIAlertAction *action){
//add code to make something happen once tapped
}];
UIImage *accessoryImage = [UIImage imageNamed:@"someImage"];
[button setValue:accessoryImage forKey:@"image"];对于记录，还可以使用这些私有API更改警报操作的字体。再说一次，它可能会让你的应用被拒绝，我还没有尝试提交这样的代码。
let alert = UIAlertController(title: nil, message: nil, preferredStyle: .ActionSheet)
let action = UIAlertAction(title: "Some title", style: .Default, handler: nil)
let attributedText = NSMutableAttributedString(string: "Some title")
let range = NSRange(location: 0, length: attributedText.length)
attributedText.addAttribute(NSKernAttributeName, value: 1.5, range: range)
attributedText.addAttribute(NSFontAttributeName, value: UIFont(name: "ProximaNova-Semibold", size: 20.0)!, range: range)
alert.addAction(action)
presentViewController(alert, animated: true, completion: nil)
// this has to be set after presenting the alert, otherwise the internal property __representer is nil
guard let label = action.valueForKey("__representer")?.valueForKey("label") as? UILabel else { return }
label.attributedText = attributedText对于XCode 10和更高版本中的Swift 4.2，最后两行现在是：
guard let label = (action!.value(forKey: "__representer")as? NSObject)?.value(forKey: "label") as? UILabel else { return }
label.attributedText = attributedTextStack Overflow用户
发布于 2015-09-18 01:53:22
您可以通过将色调颜色应用于UIAlertController来更改按钮颜色。
在iOS 9上，如果窗口色调颜色设置为自定义颜色，则必须在显示警报后立即应用该色调颜色。否则，色调颜色将重置为您的自定义窗口色调颜色。
// In your AppDelegate for example:
window?.tintColor = UIColor.redColor()
// Elsewhere in the App:
let alertVC = UIAlertController(title: "Title", message: "message", preferredStyle: .Alert)
alertVC.addAction(UIAlertAction(title: "Cancel", style: .Cancel, handler: nil))
alertVC.addAction(UIAlertAction(title: "Ok", style: .Default, handler: nil))
// Works on iOS 8, but not on iOS 9
// On iOS 9 the button color will be red
alertVC.view.tintColor = UIColor.greenColor()
self.presentViewController(alert, animated: true, completion: nil)
// Necessary to apply tint on iOS 9
alertVC.view.tintColor = UIColor.greenColor()Stack Overflow用户
发布于 2014-10-20 16:03:18
您可以使用以下代码更改按钮文本的颜色：
alertC.view.tintColor = your color;也许这会对你有帮助。
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原文链接：
https://stackoverflow.com/questions/26460706
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