UIAlertView、UIActionSheet、UIAlertController使用

（一）UIAlertView

1.默认样式

// UIAlertView iOS8开始 被废弃
- (void)defaultAlert
{
// iOS8被废弃
UIAlertView *alert = [[UIAlertView alloc] initWithTitle:nil message:@"测试" delegate:self cancelButtonTitle:@"取消" otherButtonTitles:@"查看",@"评论", nil];
// 因为是默认样式，所以这里可以不用写这句代码
alert.alertViewStyle = UIAlertViewStyleDefault;

[alert show];
}

// 需要遵守协议UIAlertViewDelegate来响应点击事件
#pragma mark - UIActionSheetDelegate
- (void)actionSheet:(UIActionSheet *)actionSheet clickedButtonAtIndex:(NSInteger)buttonIndex
{
NSLog(@"%ld",buttonIndex);
}

defaultAlert.gif

其中，"查看"的buttonIndex == 1，"评论"的buttonIndex == 2，"取消"的buttonIndex == 0

2.带有明文输入框

- (void)plainText
{
// iOS8被废弃
UIAlertView *alert = [[UIAlertView alloc] initWithTitle:nil message:@"输入姓名" delegate:self cancelButtonTitle:@"取消" otherButtonTitles:@"确定", nil];
alert.alertViewStyle = UIAlertViewStylePlainTextInput;
[alert show];
}

#pragma mark - UIActionSheetDelegate
- (void)actionSheet:(UIActionSheet *)actionSheet clickedButtonAtIndex:(NSInteger)buttonIndex
{
NSLog(@"%ld",buttonIndex);
}

plainTextAlert.gif

3.带有密文输入框

- (void)secureText
{
// iOS8被废弃
UIAlertView *alert = [[UIAlertView alloc] initWithTitle:nil message:@"输入姓名" delegate:self cancelButtonTitle:@"取消" otherButtonTitles:@"确定", nil];
alert.alertViewStyle = UIAlertViewStyleSecureTextInput;
[alert show];
}

#pragma mark - UIActionSheetDelegate
- (void)actionSheet:(UIActionSheet *)actionSheet clickedButtonAtIndex:(NSInteger)buttonIndex
{
NSLog(@"%ld",buttonIndex);
}

secureTextAlert.gif

4.带有登录和密码输入框

- (void)loginAndPassword
{
// iOS8被废弃
UIAlertView *alert = [[UIAlertView alloc] initWithTitle:nil message:@"登录" delegate:self cancelButtonTitle:@"取消" otherButtonTitles:@"登录",@"注册", nil];
alert.alertViewStyle = UIAlertViewStyleLoginAndPasswordInput;
[alert show];
}

loginAndPwdTextAlert.gif

（二）UIActionSheet

- (void)actionSheet
{
// iOS8被废弃
UIActionSheet *sheet = [[UIActionSheet alloc] initWithTitle:nil delegate:self cancelButtonTitle:@"取消" destructiveButtonTitle:nil otherButtonTitles:@"查看",@"评论", nil];
[sheet showInView:self.view];
}

#pragma mark - UIActionSheetDelegate
- (void)actionSheet:(UIActionSheet *)actionSheet clickedButtonAtIndex:(NSInteger)buttonIndex
{
NSLog(@"%ld",buttonIndex);
}

actionSheet.gif

（三）UIAlertController

UIAlertController从iOS8.0开始被使用。旨在替代UIAlertView和UIActionSheet这两个控件。
所以UIAlertController有一个

preferredStyle属性

属性，该属性是个

UIAlertControllerStyle

类型的枚举值，其值如下：

typedef NS_ENUM(NSInteger, UIAlertControllerStyle) {
UIAlertControllerStyleActionSheet = 0,
UIAlertControllerStyleAlert
} NS_ENUM_AVAILABLE_IOS(8_0);

不难发现，UIAlertControllerStyle的枚举值分别是

UIAlertControllerStyleActionSheet

和

UIAlertControllerStyleAlert

，如果UIAlertController对象的preferredStyle属性取值为UIAlertControllerStyleActionSheet，那么其作用和效果就相当于iOS8中被废弃的UIActionSheet。
想反，如果UIAlertController对象的preferredStyle属性取值为UIAlertControllerStyleAlert，那么其作用和效果就相当于iOS8中被废弃的UIAlertView。
我们知道，使用UIAlertView和UIActionSheet需要遵守对应的协议并实现相应的方法，因为UIAlertView和UIActionSheet采用delegate的方式处理事件。而UIAlertController则采用灵活的block方式处理事件。所以使用UIAlertController不用再遵守某个协议，只需将响应事件的代码写在block中即可。这一点，让我们想起了NSURLConnection和NSURLsession。

1.UIAlertControllerStyleActionSheet样式

- (void)actionSheet {

UIAlertController *actionSheetController = [UIAlertController alertControllerWithTitle:nil message:nil preferredStyle:UIAlertControllerStyleActionSheet];

UIAlertAction *showAllInfoAction = [UIAlertAction actionWithTitle:@"查看" style:UIAlertActionStyleDefault handler:^(UIAlertAction * _Nonnull action) {

}];
UIAlertAction *pickAction = [UIAlertAction actionWithTitle:@"评论" style:UIAlertActionStyleDefault handler:^(UIAlertAction * _Nonnull action) {

}];
UIAlertAction *cancelAction = [UIAlertAction actionWithTitle:@"取消" style:UIAlertActionStyleCancel handler:^(UIAlertAction * _Nonnull action) {

}];

[actionSheetController addAction:cancelAction];
[actionSheetController addAction:commentAction];
[actionSheetController addAction:showAllInfoAction];

[self presentViewController:actionSheetController animated:YES completion:nil];
}

actionSheetStyle.gif

2.UIAlertControllerStyleAlert样式

2.1.默认样式

UIAlertController *actionSheetController = [UIAlertController alertControllerWithTitle:nil message:nil preferredStyle:UIAlertControllerStyleAlert];

UIAlertAction *showAllInfoAction = [UIAlertAction actionWithTitle:@"查看" style:UIAlertActionStyleDefault handler:^(UIAlertAction * _Nonnull action) {

}];
UIAlertAction *commentAction = [UIAlertAction actionWithTitle:@"评论" style:UIAlertActionStyleDefault handler:^(UIAlertAction * _Nonnull action) {

}];
UIAlertAction *cancelAction = [UIAlertAction actionWithTitle:@"取消" style:UIAlertActionStyleCancel handler:^(UIAlertAction * _Nonnull action) {

}];

[actionSheetController addAction:cancelAction];
[actionSheetController addAction:commentAction];
[actionSheetController addAction:showAllInfoAction];

[self presentViewController:actionSheetController animated:YES completion:nil];

alertStyle.gif

文本框样式

- (void)alertStyleWithTextField
{
UIAlertController *actionSheetController = [UIAlertController alertControllerWithTitle:nil message:@"输入姓名" preferredStyle:UIAlertControllerStyleAlert];
[actionSheetController addTextFieldWithConfigurationHandler:^(UITextField * _Nonnull textField) {
textField.placeholder = @"请输入姓名";
}];

UIAlertAction *determineAction = [UIAlertAction actionWithTitle:@"确定" style:UIAlertActionStyleDefault handler:^(UIAlertAction * _Nonnull action) {

}];

UIAlertAction *cancelAction = [UIAlertAction actionWithTitle:@"取消" style:UIAlertActionStyleCancel handler:^(UIAlertAction * _Nonnull action) {

}];

[actionSheetController addAction:determineAction];
[actionSheetController addAction:cancelAction];

[self presentViewController:actionSheetController animated:YES completion:nil];
}

alertTextFieldStyle.gif

2.3.登录模式

- (void)alertStyleWithTwoTextField
{
UIAlertController *actionSheetController = [UIAlertController alertControllerWithTitle:nil message:@"登录" preferredStyle:UIAlertControllerStyleAlert];
[actionSheetController addTextFieldWithConfigurationHandler:^(UITextField * _Nonnull textField) {
textField.placeholder = @"账号";
}];
[actionSheetController addTextFieldWithConfigurationHandler:^(UITextField * _Nonnull textField) {
textField.placeholder = @"密码";
textField.secureTextEntry = YES;
}];

UIAlertAction *determineAction = [UIAlertAction actionWithTitle:@"确定" style:UIAlertActionStyleDefault handler:^(UIAlertAction * _Nonnull action) {

}];

UIAlertAction *cancelAction = [UIAlertAction actionWithTitle:@"取消" style:UIAlertActionStyleCancel handler:^(UIAlertAction * _Nonnull action) {

}];

[actionSheetController addAction:determineAction];
[actionSheetController addAction:cancelAction];

[self presentViewController:actionSheetController animated:YES completion:nil];
}

alertTwoTextFieldStyle.gif

demo地址: https://github.com/nlgb/AlertAndActionSheetDemo

文／VV木公子（简书作者）
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