iOS8之后,Xcode提供的提醒框架启用UIAlertController,用法跟之前差别还有的,见效果图和代码.
demo演示
1.样式一:
self.alertVc = [UIAlertController alertControllerWithTitle:@"标题一" message:@"这里是要显示的信息" preferredStyle:UIAlertControllerStyleAlert];
//弹出视图,使用UIViewController的方法
[self presentViewController:self.alertVc animated:YES completion:^{
//隔一会就消失
[self dismissViewControllerAnimated:YES completion:^{
}];
}];
2.样式二:
self.alertVc = [UIAlertController alertControllerWithTitle:@"标题二" message:@"这里是要显示的信息" preferredStyle:UIAlertControllerStyleActionSheet];
//弹出视图,使用UIViewController的方法
[self presentViewController:self.alertVc animated:YES completion:^{
//隔一会就消失
[self dismissViewControllerAnimated:YES completion:^{
}];
}];
3.样式三:
self.alertVc = [UIAlertController alertControllerWithTitle:@"标题三" message:@"这是标题内容" preferredStyle:UIAlertControllerStyleActionSheet];//UIAlertControllerStyleActionSheet
UIAlertAction *cancelAction = [UIAlertAction actionWithTitle:@"退出" style:UIAlertActionStyleCancel handler:^(UIAlertAction * _Nonnull action) {
}];
UIAlertAction *sureAction = [UIAlertAction actionWithTitle:@"确定" style:UIAlertActionStyleDefault handler:^(UIAlertAction * _Nonnull action) {
}];
#warning 修改字体颜色,属于私有Api 慎用
[cancelAction setValue:[UIColor redColor] forKey:@"_titleTextColor"];[self.alertVc addAction:cancelAction];
[self.alertVc addAction:sureAction];
//弹出视图,使用UIViewController的方法
[self presentViewController:self.alertVc animated:YES completion:^{
}];
4.样式四:
self.alertVc = [UIAlertController alertControllerWithTitle:@"标题四" message:@"标题内容" preferredStyle:UIAlertControllerStyleAlert];
[self.alertVc addTextFieldWithConfigurationHandler:^(UITextField * _Nonnull textField) {
textField.placeholder = @"请输入用户名";
}];
[self.alertVc addTextFieldWithConfigurationHandler:^(UITextField * _Nonnull textField) {
textField.placeholder = @"请输入密码";
textField.secureTextEntry = YES;
}];
//对UITextField开始监听
[self.alertVc addTextFieldWithConfigurationHandler:^(UITextField * _Nonnull textField) {
textField.placeholder = @"输入可以监听到";
_textField = textField;
#warning 监听输入,可以使用通知,可以kvo等,如果是下边的这种方式,容易retain,造成循环引用,所以声明一个全局变量textField,然后在block监听,就不会造成循环引用(capturing 'self'strong in this block is likely to lead to a retain cycle)
// [textField addTarget:self action:@selector(watchTextFieldMethod:) forControlEvents:UIControlEventEditingChanged];
}];
[_textField addTarget:self action:@selector(watchTextFieldMethod:) forControlEvents:UIControlEventEditingChanged];
//添加确定和取消按钮
UIAlertAction *cacleAction = [UIAlertAction actionWithTitle:@"取消" style:UIAlertActionStyleCancel handler:^(UIAlertAction * _Nonnull action) {
}];
UIAlertAction *sureAction = [UIAlertAction actionWithTitle:@"确定" style:UIAlertActionStyleDestructive handler:^(UIAlertAction * _Nonnull action) {
}];
[self.alertVc addAction:cacleAction];
[self.alertVc addAction:sureAction];
[self presentViewController:self.alertVc animated:YES completion:^{
}];
