//初始化警告框
UIAlertController*alert = [UIAlertController
alertControllerWithTitle: @"提示"
message: @"我被点击了"
preferredStyle:UIAlertControllerStyleAlert];
[alert addAction:[UIAlertAction
actionWithTitle:@"确定"
style:UIAlertActionStyleDefault handler:^(UIAlertAction * _Nonnull action)
{
}]];
//弹出提示框
[self presentViewController:alert
animated:YES completion:nil];
UIAlertController*alert = [UIAlertController alertControllerWithTitle:@"开始" message:@"开始了"
preferredStyle:UIAlertControllerStyleActionSheet];
//UIAlertControllerStyleActionSheet:显示在屏幕底部
//设置按钮
UIAlertAction*action = [UIAlertAction
actionWithTitle:@"确定"
style:UIAlertActionStyleDefault handler:nil];
UIAlertAction*action1 = [UIAlertAction
actionWithTitle:@"取消" style:UIAlertActionStyleCancel
handler:nil];
[alert addAction:action];
[alert addAction:action1];
[self presentViewController:alert
animated:YES completion:nil];
//警告框
UIAlertView *alert = [[UIAlertView
alloc]initWithTitle:@"提示" message:@"我被点击了" delegate:self cancelButtonTitle:@"确定" otherButtonTitles:@"取消",
nil];
[alert show];
内存警告的方法
- (void)didReceiveMemoryWarning {
[super didReceiveMemoryWarning];
/*
内存警告来源:手机内存80M,程序运行过程中,内存接近80M时,程序会为每个视图控制器发送内存警告消息
didReceiveMemoryWarning:处理内存警告,ios6之后不再处理
*/
