Ios UIAlertController文本对齐
有没有办法更改iOS 8上UIAlertController内显示的消息的对齐方式 我认为访问子视图并更改UILabel的子视图已不可能了。会公开文本字段，因此可能会用于配置它们： 文本字段 警报显示的文本字段数组。只读 声明 迅捷的 目标-C 讨论 用这个 属性访问警报显示的文本字段。正文 字段按您添加到警报中的顺序排列 控制器。此顺序也对应于它们的排列顺序 显示在警报中Ios UIAlertController文本对齐,ios,ios8,uialertcontroller,Ios,Ios8,Uialertcontroller,有没有办法更改iOS 8上UIAlertController内显示的消息的对齐方式 我认为访问子视图并更改UILabel的子视图已不可能了。会公开文本字段，因此可能会用于配置它们： 文本字段 警报显示的文本字段数组。只读 声明 迅捷的 目标-C 讨论 用这个 属性访问警报显示的文本字段。正文 字段按您添加到警报中的顺序排列 控制器。此顺序也对应于它们的排列顺序 显示在警报中 注意：尽管它说属性是只读的，但它返回一个文本字段对象引用数组，可用于修改控件。我已成功使用以下方法来对齐UIAlertCo
注意：尽管它说属性是只读的，但它返回一个文本字段对象引用数组，可用于修改控件。我已成功使用以下方法来对齐UIAlertController的文本并设置其样式：
let paragraphStyle = NSMutableParagraphStyle()
paragraphStyle.alignment = NSTextAlignment.Left
let messageText = NSMutableAttributedString(
string: "The message you want to display",
attributes: [
NSParagraphStyleAttributeName: paragraphStyle,
NSFontAttributeName : UIFont.preferredFontForTextStyle(UIFontTextStyleBody),
NSForegroundColorAttributeName : UIColor.blackColor()
]
)
myAlert.setValue(messageText, forKey: "attributedMessage")
let messageText = NSMutableAttributedString(
string: "The message you want to display",
attributes: [
NSParagraphStyleAttributeName: paragraphStyle,
NSFontAttributeName : UIFont.preferredFont(forTextStyle: UIFontTextStyle.body),
NSForegroundColorAttributeName : UIColor.black
]
)
myAlert.setValue(messageText, forKey: "attributedMessage")
导航到子视图树，直到找到标题和消息的UILabels
NSArray *viewArray = [[[[[[[[[[[[alertController view] subviews] firstObject] subviews] firstObject] subviews] firstObject] subviews] firstObject] subviews] firstObject] subviews];
UILabel *alertTitle = viewArray[0]
UILabel *alertMessage = viewArray[1];
alertMessage.textAlignment = NSTextAlignmentLeft;
@interface UIAlertController (ShowMeTheLabels)
@property (nonatomic, strong) UILabel *titleLabel, *messageLabel;
@end
@implementation UIAlertController (ShowMeTheLabels)
@dynamic titleLabel;
@dynamic messageLabel;
- (NSArray *)viewArray:(UIView *)root {
NSLog(@"%@", root.subviews);
static NSArray *_subviews = nil;
_subviews = nil;
for (UIView *v in root.subviews) {
if (_subviews) {
break;
}
if ([v isKindOfClass:[UILabel class]]) {
_subviews = root.subviews;
return _subviews;
}
[self viewArray:v];
}
return _subviews;
}
- (UILabel *)titleLabel {
return [self viewArray:self.view][0];
}
- (UILabel *)messageLabel {
return [self viewArray:self.view][1];
}
@end
yourAlertController.messageLabel.textAlignment = NSTextAlignmentLeft;
UIAlertController * alert = [UIAlertController
alertControllerWithTitle:[title lowercaseString]
message:[message lowercaseString]
preferredStyle:UIAlertControllerStyleAlert];
if (alertStyle == kUIAlertStylePlainText)
{
[alert addTextFieldWithConfigurationHandler:^(UITextField *textField) {
}];
}
if (okTitle) {
UIAlertAction* ok = [UIAlertAction actionWithTitle:[okTitle lowercaseString] style:UIAlertActionStyleDefault
handler:^(UIAlertAction * action) {
callback(alert, action, nil);
}];
[alert addAction:ok];
}
if (cancelTitle) {
UIAlertAction* cancel = [UIAlertAction actionWithTitle:[cancelTitle lowercaseString] style:UIAlertActionStyleDefault
handler:^(UIAlertAction * action) {
callback(alert, nil, action);
}];
[alert addAction:cancel];
}
NSMutableParagraphStyle *paraStyle = [[NSMutableParagraphStyle alloc] init];
paraStyle.alignment = NSTextAlignmentLeft;
NSMutableAttributedString *atrStr = [[NSMutableAttributedString alloc] initWithString:[message lowercaseString] attributes:@{NSParagraphStyleAttributeName:paraStyle,NSFontAttributeName:[UIFont systemFontOfSize:13.0]}];
[alert setValue:atrStr forKey:@"attributedMessage"];
[viewInstance presentViewController:alert animated:YES completion:nil];
以下方法将设置文本对齐方式，同时保留默认字体大小
static void makeAlertControllerLeftAligned( UIAlertController* avc )
{
NSMutableParagraphStyle *paraStyle = [[[NSMutableParagraphStyle alloc] init] autorelease];
paraStyle.alignment = NSTextAlignmentLeft;
NSMutableAttributedString *atrStr =
[[[NSMutableAttributedString alloc] initWithString:avc.message attributes:@{
NSParagraphStyleAttributeName:paraStyle,
NSFontAttributeName: [UIFont preferredFontForTextStyle: UIFontTextStyleFootnote],
}]
autorelease];
[avc setValue:atrStr forKey:@"attributedMessage"];
}
public extension UIAlertController {
func setMessageAlignment(_ alignment : NSTextAlignment) {
let paragraphStyle = NSParagraphStyle.default.mutableCopy() as! NSMutableParagraphStyle
paragraphStyle.alignment = alignment
let messageText = NSMutableAttributedString(
string: self.message ?? "",
attributes: [
NSAttributedString.Key.paragraphStyle: paragraphStyle,
NSAttributedString.Key.font: UIFont.systemFont(ofSize: 12),
NSAttributedString.Key.foregroundColor: UIColor.gray
]
)
self.setValue(messageText, forKey: "attributedMessage")
}
}
然后您可以简单地设置对齐值：myAlert.setMessageAlignment.left这些不就是您可以添加到UIAlertController的UITextFields吗？我只通过message属性显示一个文本，该属性的样式为项目符号列表，因此将受益于左对齐。@DominikKaisers是的，你是对的；也许您可以使用文本字段而不使用message属性？是的，这可能是一个解决方法。如果没有人有更简单的方法，我会尝试一下。这些是文本输入字段，而不是消息。似乎这是私人API使用，这是否进入了应用商店？@powerj1984是的，它进入了应用商店。它有什么私密性？有任何objective-c版本吗？@SonicMaster抱歉，但我没有objective-c的经验。我想，因为这主要是赋值和调用函数，所以转换应该很简单。NSArray*viewArray=[[[[alertController视图]子视图]第一对象]子视图]第一对象]子视图]第一对象]子视图]第一对象]子视图]第一对象]子视图]；这是我从未见过的最嵌套的对象。是的。苹果真的不想让人们把它搞砸。制作自定义弹出警报比修补嵌套得太深的东西要好得多。他们从未兑现承诺，在2013年的一次会议上，他们提到他们添加了UIView属性，以便我们可以在其中放入任何我们想要的东西。。。实际上，我想这是当前API的正确现代答案！它就像一个符咒！含糖的谢谢你，伙计！有人进入应用商店了吗？这是直截了当的，看起来不太粗糙，应该稳定一段时间请在代码周围添加解释。以便OP和未来的读者能够轻松理解您的答案。
yourAlertController.messageLabel.textAlignment = NSTextAlignmentLeft;
UIAlertController * alert = [UIAlertController
alertControllerWithTitle:[title lowercaseString]
message:[message lowercaseString]
preferredStyle:UIAlertControllerStyleAlert];
if (alertStyle == kUIAlertStylePlainText)
{
[alert addTextFieldWithConfigurationHandler:^(UITextField *textField) {
}];
}
if (okTitle) {
UIAlertAction* ok = [UIAlertAction actionWithTitle:[okTitle lowercaseString] style:UIAlertActionStyleDefault
handler:^(UIAlertAction * action) {
callback(alert, action, nil);
}];
[alert addAction:ok];
}
if (cancelTitle) {
UIAlertAction* cancel = [UIAlertAction actionWithTitle:[cancelTitle lowercaseString] style:UIAlertActionStyleDefault
handler:^(UIAlertAction * action) {
callback(alert, nil, action);
}];
[alert addAction:cancel];
}
NSMutableParagraphStyle *paraStyle = [[NSMutableParagraphStyle alloc] init];
paraStyle.alignment = NSTextAlignmentLeft;
NSMutableAttributedString *atrStr = [[NSMutableAttributedString alloc] initWithString:[message lowercaseString] attributes:@{NSParagraphStyleAttributeName:paraStyle,NSFontAttributeName:[UIFont systemFontOfSize:13.0]}];
[alert setValue:atrStr forKey:@"attributedMessage"];
[viewInstance presentViewController:alert animated:YES completion:nil];
static void makeAlertControllerLeftAligned( UIAlertController* avc )
{
NSMutableParagraphStyle *paraStyle = [[[NSMutableParagraphStyle alloc] init] autorelease];
paraStyle.alignment = NSTextAlignmentLeft;
NSMutableAttributedString *atrStr =
[[[NSMutableAttributedString alloc] initWithString:avc.message attributes:@{
NSParagraphStyleAttributeName:paraStyle,
NSFontAttributeName: [UIFont preferredFontForTextStyle: UIFontTextStyleFootnote],
}]
autorelease];
[avc setValue:atrStr forKey:@"attributedMessage"];
}
let paragraphStyle = NSParagraphStyle.default.mutableCopy() as! NSMutableParagraphStyle
paragraphStyle.headIndent = 14
let messageText = NSMutableAttributedString(
string: "... multiline string need linebreak indentation ...",
attributes: [
NSAttributedString.Key.paragraphStyle: paragraphStyle,
NSAttributedString.Key.font: UIFont.systemFont(ofSize: 12),
NSAttributedString.Key.foregroundColor: UIColor.gray
]
)
alert.setValue(messageText, forKey: "attributedMessage")
yourAlertController.messageLabel.textAlignment = NSTextAlignmentLeft;
public extension UIAlertController {
func setMessageAlignment(_ alignment : NSTextAlignment) {
let paragraphStyle = NSParagraphStyle.default.mutableCopy() as! NSMutableParagraphStyle
paragraphStyle.alignment = alignment
let messageText = NSMutableAttributedString(
string: self.message ?? "",
attributes: [
NSAttributedString.Key.paragraphStyle: paragraphStyle,
NSAttributedString.Key.font: UIFont.systemFont(ofSize: 12),
NSAttributedString.Key.foregroundColor: UIColor.gray
]
)
self.setValue(messageText, forKey: "attributedMessage")
}
}