本来是打算详细研究下ActionSheet的一些属性,上午就把这篇博客写了,结果老师找办点事,就这样耽搁了,但是今天不能没有记录,只是简单记一下,讲到ActionSheet不禁就会想到Alert,他们有什么区别呢?
Action Sheet就像Windows中的 “确定-取消”对话框一样,用于强制用户进行选择。当用户将要进行的操作具有一定危险时,常常使用Action Sheet对用户进行危险提示,这样,用户有机会进行取消操作。
Alert相当于Windows中的Messagebox,跟Action Sheet也是类似的。不同的是,Alert可以只有一个选择项,而Action Sheet却至少要两个选项。
1.创建一个新工程叫ActionSheetDemo; File->New->Project ->single View Application -> next
2.因为用到了ActionSheet和Alert委托方法,把ActionSheet和Alert协议添加上,在声明下两个对象
#import <UIKit/UIKit.h>
@interface ASDViewController : UIViewController<UIAlertViewDelegate,UIActionSheetDelegate>
{
UIActionSheet *actionSheet;
UIAlertView *alert ;
}
-(void)buttonClicked:(id)sender;
@end
3.ViewDidLod中代码基本都加注释了,直接贴上代码
- (void)viewDidLoad
{
[super viewDidLoad];
// Do any additional setup after loading the view, typically from a nib.
CGRect frame = CGRectMake(50, 100, 200, 70);
UIButton *myButon = [UIButton buttonWithType:UIButtonTypeRoundedRect];
myButon.frame = frame;
// 设置视图标题
[myButon setTitle:@"测试ActionSheet" forState:UIControlStateNormal];
// [myButon setTitleColor:[UIColor blackColor] forState:UIControlStateNormal];//设置Button没有被选择的时候的字体颜色,选中后就变成默认的蓝色字体
myButon.titleLabel.textColor = [UIColor blackColor];//也是字体颜色设置,和上没方法一样
[myButon setBackgroundColor:[UIColor clearColor]];//背景色设置
// myButon.contentHorizontalAlignment = UIControlContentHorizontalAlignmentLeft;//button标题对齐方式,默认居中
// 给myButton添加一个事件buttonClicked
[myButon addTarget:self action:@selector(buttonClicked:) forControlEvents:UIControlEventTouchUpInside];
//把按钮添加到view视图上
[self.view addSubview:myButon];
/* //看博客时,以前没接触这个进度条控件,做测试用,搁着看的 http://www.cocoachina.com/iphonedev/toolthain/2011/1223/3778.html
UIProgressView *progressView = [[UIProgressView alloc] initWithProgressViewStyle:UIProgressViewStyleBar];
progressView.frame = CGRectMake(20, 300, 200, 30);
[alert addSubview:progressView];
*/
}
如果Button显示不出来,可以看看代码写Button遇到问题这篇博客,有些问题我这种菜鸟是解释不清楚的
4.Button点击事件,
-(void)buttonClicked:(id)sender
{
UIAlertView *alerttest = [[UIAlertView alloc] initWithTitle:@"提示"
message:@"你点击了测试ActionSheet这个按钮" delegate:self
cancelButtonTitle:@"嗯嗯 了解"
otherButtonTitles:@"弹出ActionSheet吧",@"无所谓",@"有所谓", nil];
[alerttest addButtonWithTitle:@"不发表意见"];//可以在Alrt上再添加一个Button
alert=alerttest;
[alert show];
}
5.这里我说一下Alert的一些委托方法,用的比较少吧,其他的也没做测试,测试也就是在委托方法里NSLog一下,再在终端下查看输出结果,通过点击按钮查看这些输出结果http://blog.youkuaiyun.com/duxinfeng2010/article/details/7702157这里面有,也就不在写出
//根据被点击按钮索引处理点击事件
-(void)alertView:(UIAlertView *)alertView clickedButtonAtIndex:(NSInteger)buttonIndex
{
/********************************************************************************************
本想试试发挥下switch()的左右,可是在buttonIdex==2的时候,想加入一个Actionsheet,结果报错,说case 是保护数据,
********************************************************************************************
switch (buttonIndex) {
case 0:
NSLog(@"取消按钮");
break;
case 1:
NSLog(@"弹出ActionSheet吧");
break;
case 2:
NSLog(@"有所谓了");
break;
case 3:
NSLog(@"无所谓了");
break;
case 4:
NSLog(@"不发表意见");
break;
default:
break;
}
********************************************************************************************/
if (buttonIndex == 0) {
NSLog(@"取消按钮");
}
else if (buttonIndex == 1) {
UIActionSheet *sheet = [[UIActionSheet alloc] initWithTitle:@"操作选项" delegate:self
cancelButtonTitle:@"取消"
destructiveButtonTitle:@"确认取消?" otherButtonTitles:@"Test1",@"Test2",@"Test4", nil];
[sheet showInView:self.view];
}
else if(buttonIndex == 2)
{
NSLog(@"有所谓了");
}
else if (buttonIndex == 3) {
NSLog(@"无所谓了");
}
else {
NSLog(@"不发表意见");
}
}
//AlertView已经消失处理的事件
-(void)alertView:(UIAlertView *)alertView didDismissWithButtonIndex:(NSInteger)buttonIndex
{
}
//AlertView即将消失时,处理的事件
-(void)alertView:(UIAlertView *)alertView willDismissWithButtonIndex:(NSInteger)buttonIndex
{
}
//AlertView 取消时
-(void)alertViewCancel:(UIAlertView *)alertView
{
}
//AlertView已经显示的时候
-(void)didPresentAlertView:(UIAlertView *)alertView
{
}
//AlertView即将显示
-(void)willPresentAlertView:(UIAlertView *)alertView
{
}
ActionSheet和Alert写法一样,原本我想在Alert的“你点击了测试ActionSheet这个按钮”时调用我写的一个弹出ActionSheet,但是根据按钮的索引值(buttonIndex)我不知道怎么来确定这个按钮对象,也就不会怎么用addTarget: action: forControlEvents:方法来在这个委托方法外,再写一个函数了,所以也就直接在委托方法中吧ActionSheet写了,结果实现了,总感觉方法不是太好 UIActionSheet *sheet = [[UIActionSheet alloc] initWithTitle:@"操作选项" delegate:self
cancelButtonTitle:@"取消"
destructiveButtonTitle:@"确认取消?" otherButtonTitles:@"Test1",@"Test2",@"Test4", nil];
[sheet showInView:self.view];
6.然后把ActionSheet委托方法也写上,其实在这些委托方法里根本没多少功能,只是想让自个熟悉下都有什么委托,推荐看看这篇博客 http://blog.youkuaiyun.com/duxinfeng2010/article/details/7702169
#pragma actionSheet delegate
-(void)actionSheet:(UIActionSheet *)actionSheet clickedButtonAtIndex:(NSInteger)buttonIndex
{
if (buttonIndex == 0) {
NSLog(@"已经取消了");
}
if (buttonIndex == 1) {
UIAlertView *alerttest2 = [[UIAlertView alloc] initWithTitle:@"提示"
message:@"你在ActionSheet这个test1按钮" delegate:self
cancelButtonTitle:@"Cancel"
otherButtonTitles:@"无所谓",@"有所谓", nil];
[alerttest2 addButtonWithTitle:@"不发表意见"];//可以在Alrt上再添加一个Button
[alerttest2 show];
}
}
-(void)actionSheet:(UIActionSheet *)actionSheet didDismissWithButtonIndex:(NSInteger)buttonIndex
{
}
-(void)actionSheet:(UIActionSheet *)actionSheet willDismissWithButtonIndex:(NSInteger)buttonIndex
{
}
-(void)actionSheetCancel:(UIActionSheet *)actionSheet
{
}
-(void)didPresentActionSheet:(UIActionSheet *)actionSheet
{
}
-(void)willPresentActionSheet:(UIActionSheet *)actionSheet
{
}
附上源代码http://download.youkuaiyun.com/detail/duxinfeng2010/4402019