《IOS开发系列教程》对话框
开发窗口程序，最长用到的一个窗口就是对话框，这在MFC还是QT，亦或者是wxWidget中，都是如此，那么IOS开发中，也提供了这个功能。
我们有2个选择
- UIAlertView
- UIActionSheet
这个2个都可以做到显示一些选项，让用户选择，比如yes，no之类，不过UIActionSheet的功能更加丰富一点，可以提供更多的选项给用户，比如让用户的选择使用哪种账号登陆，google，facebook，twitter。
| UIAlertView | UIActionSheet |
|---|---|
|
|
使用UIAlertView：
让要显示对话框的类继承自UIAlertViewDelegate
比如：
@interface xxxViewController : UIViewController <UIAlertViewDelegate>
调用对话框：
UIAlertView *message = [[UIAlertView alloc] initWithTitle:@"Hello World!"
message:@"This is your first UIAlertview message."
delegate:self
cancelButtonTitle:@"Button 1"
otherButtonTitles:@"Button 2", @"Button 3", nil];
[message show];
对话框的回调函数，
这个在 xxxViewController.m中实现
这个函数中检查用户选择了哪个选项
- (void)alertView:(UIAlertView *)alertView clickedButtonAtIndex:(NSInteger)buttonIndex
{
NSString *title = [alertView buttonTitleAtIndex:buttonIndex];
if([title isEqualToString:@"Button 1"])
{
NSLog(@"Button 1 was selected.");
}
else if([title isEqualToString:@"Button 2"])
{
NSLog(@"Button 2 was selected.");
}
else if([title isEqualToString:@"Button 3"])
{
NSLog(@"Button 3 was selected.");
}
}
使用UIActionSheet：
让要显示对话框的类继承自UIActionSheetDelegate
比如：
@interface xxxViewController : UIViewController <UIActionSheetDelegate>
调用显示：
NSString *actionSheetTitle = @"Action Sheet Demo"; //Action Sheet Title
NSString *destructiveTitle = @"Destructive Button"; //Action Sheet Button Titles
NSString *other1 = @"Other Button 1";
NSString *other2 = @"Other Button 2";
NSString *other3 = @"Other Button 3";
NSString *cancelTitle = @"Cancel Button";
UIActionSheet *actionSheet = [[UIActionSheet alloc]
initWithTitle:actionSheetTitle
delegate:self
cancelButtonTitle:cancelTitle
destructiveButtonTitle:destructiveTitle
otherButtonTitles:other1, other2, other3, nil];
[actionSheet showInView:self.view];
定义回调函数并且检查用户选择的选项：
- (void)actionSheet:(UIActionSheet *)popup clickedButtonAtIndex:(NSInteger)buttonIndex {
switch (popup.tag) {
case 1: {
switch (buttonIndex) {
case 0:
[self FBShare];
break;
case 1:
[self TwitterShare];
break;
case 2:
[self emailContent];
break;
case 3:
[self saveContent];
break;
case 4:
[self rateAppYes];
break;
default:
break;
}
break;
}
default:
break;
}
}
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