你不知道的AlertController

今天来分享如何来自定义AlertController，大家可以按照我的方法封装各种各样的控件，相当简单可靠，需要调用只需要一行代码。

效果:

演示动画.gif

实现思路

创建工具类KYPickerView

工具类的目的是更方便的调用自定义AlertController。废话不多上,上代码。

/**
 自定义选择器

 @param target target
 @param options Picker要显示的数据
 @param title Alter的Title
 @param block block
 */
+ (void)showPickerWithTarget:(id)target Options:(NSArray *)options title:(NSString *)title selectionBlock:(void (^)(NSString *selectedOption))block{
    KYAlertPickerController *alertController = [KYAlertPickerController alertControllerWithTitle:title message:@"\n\n\n\n\n\n\n\n\n\n\n"preferredStyle:UIAlertControllerStyleActionSheet];
    alertController.options = options;
    alertController.pickerTitle = title;
    [alertController setPickerDoneBlock:block];
    [target presentViewController:alertController animated:YES completion:nil];
}

实现类KYAlertPickerController

KYAlertPickerController继承自UIAlertController，同时为了保证弹出的AlertView具有一定的高度，创建时可以用@"\n"来填充。显示出来的AlterView的结构大概如下图:

KYAlertPickerController结构图

实现核心代码

- (void)initView {
    self.toolbar = [[UIToolbar alloc] init];
    self.toolbar.clipsToBounds = YES;
    
    //自定义取消按钮，可自定义自己喜欢的样式
    UIButton *cancelBtn = [UIButton buttonWithType:UIButtonTypeCustom];
    cancelBtn.frame = CGRectMake(0, 5, 30, 30);
    [cancelBtn setTitleColor:[UIColor blackColor] forState:UIControlStateNormal];
    [cancelBtn addTarget:self action:@selector(pickerCancel:) forControlEvents:UIControlEventTouchUpInside];
    [cancelBtn setTitle:@"取消" forState:UIControlStateNormal];
    cancelBtn.titleLabel.font = [UIFont systemFontOfSize:13];
    
    UIBarButtonItem *cancelButton = [[UIBarButtonItem alloc]initWithCustomView:cancelBtn];
    
    //自定义取消按钮，可自定义自己喜欢的样式
    UIButton *doneBtn = [UIButton buttonWithType:UIButtonTypeCustom];
    doneBtn.frame = CGRectMake(0, 5, 30, 30);
    [doneBtn setTitleColor:[UIColor redColor] forState:UIControlStateNormal];
    [doneBtn addTarget:self action:@selector(pickerDone:) forControlEvents:UIControlEventTouchUpInside];
    [doneBtn setTitle:@"完成" forState:UIControlStateNormal];
    doneBtn.titleLabel.font = [UIFont systemFontOfSize:13];
    UIBarButtonItem *doneButton = [[UIBarButtonItem alloc]initWithCustomView:doneBtn];
    
    //空格
    UIBarButtonItem *flexibleButton = [[UIBarButtonItem alloc] initWithBarButtonSystemItem:UIBarButtonSystemItemFlexibleSpace target:nil action:nil];
    //标题按钮
    self.titleButton = [[UIBarButtonItem alloc] initWithTitle:self.pickerTitle style:UIBarButtonItemStylePlain target:nil action:nil];
    self.titleButton.tintColor = [UIColor blackColor];
    
    //设置UIToolBar
    [self.toolbar setItems:@[cancelButton,flexibleButton,self.titleButton,flexibleButton,doneButton]];
    
    //添加ToolBar
    [self.view addSubview:self.toolbar];
    
    [self createPickerView];
}

- (void)createPickerView {
    self.pickerView = [[UIPickerView alloc] init];
    self.pickerView.clipsToBounds = YES;
    self.pickerView.dataSource = self;
    self.pickerView.delegate = self;
    self.pickerView.showsSelectionIndicator = YES;
    [self.view addSubview:self.pickerView];
}

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github下载地址：https://github.com/kangyiii/KYAlterPickerDemo
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