今天在研究UIActionSheet 直接把代码放到viewDidLoad中来执行,费了半天的劲总是出现问题,也怀疑过是不是xcode的问题,后来发现平时用都是放到一个button的方法里来操作,于是有个观点产生UIActionSheet必须配合动作时才有效果。于是去查看开发文档,上面有句话也验证了观点:Action sheets display a set of buttons representing several alternative choices to complete a task initiated by the user.
官方文档:https://developer.apple.com/library/ios/documentation/UserExperience/Conceptual/UIKitUICatalog/UIActionSheet.html
UIActionSheet *actionSheet = [[UIActionSheet alloc]initWithTitle:@"first ActionSheet" delegate:self cancelButtonTitle:@"取消" destructiveButtonTitle:@"删除" otherButtonTitles:@"保持", nil];
actionSheet.actionSheetStyle = UIActionSheetStyleBlackTranslucent;
[actionSheet showInView:self.view];
#pragma mark---实现UIActionSheetDelegate协议
- (void)actionSheet:(UIActionSheet *)actionSheet clickedButtonAtIndex:(NSInteger)buttonIndex{
if (buttonIndex == 0) {
[self showAlert:@"确定"];
}else if (buttonIndex == 1) {
[self showAlert:@"第一项"];
}else if(buttonIndex == 2) {
[self showAlert:@"第二项"];
}else if(buttonIndex == 3) {
[self showAlert:@"取消"];
}
NSString *buttonTitle = [actionSheet buttonTitleAtIndex:buttonIndex];
NSLog(@"buttonTitle = %@",buttonTitle);
}
actionSheet.actionSheetStyle = UIActionSheetStyleBlackOpaque;//设置样式
参数解释:
cancelButtonTitle destructiveButtonTitle是系统自动的两项。
otherButtonTitles是自己定义的项,注意,最后一个参数要是nil。
[actionSheet showInView:self.view];这行语句的意思是在当前view显示Action sheet。当然还可以用其他方法显示Action sheet。
看到那个红色的按钮没?那是ActionSheet支持的一种所谓的销毁按钮,对某户的某个动作起到警示作用,
比如永久性删除一条消息或图像时。如果你指定了一个销毁按钮他就会以红色高亮显示:
actionSheet.destructiveButtonIndex=1;
与导航栏类似,操作表单也支持三种风格 :
UIActionSheetStyleDefault //默认风格:灰色背景上显示白色文字
UIActionSheetStyleBlackTranslucent //透明黑色背景,白色文字
UIActionSheetStyleBlackOpaque //纯黑背景,白色文字
用法:
actionSheet.actionSheetStyle = UIActionSheetStyleBlackOpaque;//设置样式
ios中UIActionSheet的误区,布布扣,bubuko.com
原文地址:http://blog.csdn.net/eduora_meimei/article/details/25226275