UIAlertController

效果图

UIAlertController 是iOS8 之后推出的!实际使用中我们遇到连个AlertAction 颜色不一样的问题!

下面给出怎么更改系统的UIAlertController AlertAction字体颜色

修改标题的内容，字号，颜色。使用的key值是“attributedTitle”

NSMutableAttributedString *str = [[NSMutableAttributedString alloc]initWithString:@"你好吗"];
[str addAttributes:@{NSFontAttributeName : [UIFont systemFontOfSize:18],NSForegroundColorAttributeName : [UIColor redColor]}

NSMutableAttributedString *str = [[NSMutableAttributedString alloc]initWithString:@"你好吗"];

[str addAttributes:@{NSFontAttributeName : [UIFont systemFontOfSize:18],NSForegroundColorAttributeName : [UIColor redColor]} range:NSMakeRange(0, [str string].length)];

[alertVC setValue:str forKey:@"attributedTitle"];

修改AlertAction 字体颜色

_titleTextColor 修改字体颜色的关键字

[ok setValue:[UIColor purpleColor] forKey:@"_titleTextColor"];
[cancel setValue:[UIColor orangeColor] forKey:@"_titleTextColor"];

修改字体颜色效果图

实际使用中会用到输入文字 如登录

 UIAlertController *alertVC = [UIAlertController alertControllerWithTitle:title message:message preferredStyle:UIAlertControllerStyleAlert];

[alertVC addTextFieldWithConfigurationHandler:^(UITextField * _Nonnull textField) {
textField.placeholder = @"登录";
}];

[alertVC addTextFieldWithConfigurationHandler:^(UITextField * _Nonnull textField) {
  textField.placeholder = @"密码";
}];

UIAlertAction *ok = [UIAlertAction actionWithTitle:@"登录" style:UIAlertActionStyleDefault handler:^(UIAlertAction * _Nonnull action) {
    NSLog(@"登录 = %@",[alertVC.textFields firstObject].text);
    NSLog(@"密码 = %@",[alertVC.textFields lastObject].text);
}];

然后通过textFields 这个属性来获取输入的文字

 NSLog(@"登录 = %@",[alertVC.textFields firstObject].text);
 NSLog(@"密码 = %@",[alertVC.textFields lastObject].text);

带输入框alert

通过修改枚举值 UIAlertControllerStyleActionSheet 弹出sheet

UIAlertController *alertVC = [UIAlertController alertControllerWithTitle:title message:message preferredStyle:UIAlertControllerStyleActionSheet];

UIAlertControllerStyleActionSheet

很多时候我们都会用到pop视图 iOS 8之后苹果出UIPopoverPresentationController 直接上栗子

1. 点击导航栏item

 PopViewController *popViewController = [[PopViewController alloc] init];
popViewController.modalPresentationStyle = UIModalPresentationPopover;
popViewController.popoverPresentationController.barButtonItem = sender;
popViewController.popoverPresentationController.permittedArrowDirections = UIPopoverArrowDirectionUp;
popViewController.popoverPresentationController.backgroundColor = popViewController.view.backgroundColor;
popViewController.preferredContentSize = CGSizeMake(100, 150);
popViewController.popoverPresentationController.delegate = popViewController;
[self presentViewController:popViewController animated:YES completion:NULL];

点击item弹出效果图

1. 点击自定义按钮

 PopViewController *popViewController = [[PopViewController alloc] init];
popViewController.modalPresentationStyle = UIModalPresentationPopover;
popViewController.popoverPresentationController.sourceView = self.popBtn;
popViewController.popoverPresentationController.sourceRect = self.popBtn.bounds;
popViewController.popoverPresentationController.permittedArrowDirections = UIPopoverArrowDirectionUp;
popViewController.popoverPresentationController.backgroundColor = popViewController.view.backgroundColor;
popViewController.preferredContentSize = CGSizeMake(100, 150);
popViewController.popoverPresentationController.delegate = popViewController;
[self presentViewController:popViewController animated:YES completion:NULL];

点击自定义按钮效果图

3.实现代理方法

//代理方法需要的实现方式

- (UIModalPresentationStyle)adaptivePresentationStyleForPresentationController:(UIPresentationController *)controller {

return UIModalPresentationNone;

}
// 是否可以dismiss,返回YES代表可以，返回NO代表不可以(点击空白区域)
- (BOOL)popoverPresentationControllerShouldDismissPopover:(UIPopoverPresentationController *)popoverPresentationController {

return YES;

}

最后献上demo下载