//提示更新 更新类型：1-强制更新 2-提醒更新 3-可忽略更新
NSString *version_name = [NSString stringWithFormat:@"%@ %@", @"发现最新版本, 请下载", [data valueForKey:@"updateDescription"]];
// NSString *version_name = [NSString stringWithFormat:@"%@", @"发现最新版本, 请下载"];
UIAlertController *alertVC = [UIAlertController alertControllerWithTitle:@"检查更新" message:version_name preferredStyle:(UIAlertControllerStyleAlert)];
// Create a mutable paragraph style
NSMutableParagraphStyle *paragraphStyle = [[NSMutableParagraphStyle alloc] init];
paragraphStyle.alignment = NSTextAlignmentLeft;
// Create an attributed string with the message text and the paragraph style
NSString *messageText = version_name;
NSDictionary *attributes = @{
NSParagraphStyleAttributeName: paragraphStyle,
NSFontAttributeName: [UIFont systemFontOfSize:13.0] // Customize the font size if needed
};
NSAttributedString *attributedMessage = [[NSAttributedString alloc] initWithString:messageText attributes:attributes];
// Set the attributed message to the alert controller
[alertVC setValue:attributedMessage forKey:@"attributedMessage"];
UIAlertAction *right = [UIAlertAction actionWithTitle:@"去更新" style:UIAlertActionStyleDefault handler:^(UIAlertAction * _Nonnull action) {
NSLog(@"点击更新了");
NSString *safari_url = [data valueForKey:@"url"];
if (safari_url.length > 0) {
dispatch_async(dispatch_get_main_queue(), ^{
if ([[UIApplication sharedApplication] canOpenURL:[NSURL URLWithString:safari_url]]) {
[[UIApplication sharedApplication] openURL:[NSURL URLWithString:safari_url] options:@{} completionHandler:^(BOOL success) {
dispatch_after(dispatch_time(DISPATCH_TIME_NOW, (int64_t)(1 * NSEC_PER_SEC)), dispatch_get_main_queue(), ^{
exit(0);
});
}];
}
});
}
}];
UIAlertAction *left = [UIAlertAction actionWithTitle:@"取消" style:UIAlertActionStyleCancel handler:^(UIAlertAction * _Nonnull action) {
NSLog(@"取消");
}];
[alertVC addAction:right];
[alertVC addAction:left];
[[UIApplication sharedApplication].keyWindow.rootViewController presentViewController:alertVC animated:YES completion:^{
}];
}
解释
创建 UIAlertController:
objective
复制代码
UIAlertController *alertController = [UIAlertController alertControllerWithTitle:@"Title" message:nil preferredStyle:UIAlertControllerStyleAlert];
创建一个 UIAlertController 实例，指定标题、消息为空（因为我们会使用富文本消息），以及警告样式。
创建段落样式并设置左对齐:
objective
复制代码
NSMutableParagraphStyle *paragraphStyle = [[NSMutableParagraphStyle alloc] init];
paragraphStyle.alignment = NSTextAlignmentLeft;
创建一个 NSMutableParagraphStyle 实例，并将文本对齐方式设置为左对齐。
创建富文本消息:
objective
复制代码
NSString *messageText = @"This is a sample message that should be left aligned.";
NSDictionary *attributes = @{
NSParagraphStyleAttributeName: paragraphStyle,
NSFontAttributeName: [UIFont systemFontOfSize:13.0] // Customize the font size if needed
};
NSAttributedString *attributedMessage = [[NSAttributedString alloc] initWithString:messageText attributes:attributes];
创建一个包含消息文本的 NSAttributedString，并应用段落样式和其他属性（如字体大小）。
将富文本消息设置到 UIAlertController:
objective
复制代码
[alertController setValue:attributedMessage forKey:@"attributedMessage"];
使用 KVC (Key-Value Coding) 将富文本消息设置为 UIAlertController 的 attributedMessage 属性。
添加操作并显示警告控制器:
objective
复制代码
UIAlertAction *okAction = [UIAlertAction actionWithTitle:@"OK" style:UIAlertActionStyleDefault handler:nil];
[alertController addAction:okAction];
[self presentViewController:alertController animated:YES completion:nil];
添加一个默认样式的“OK”操作，并显示警告控制器。
