UIAlertController

楼主在整理项目的警告，于是乎你懂的。

然后自己整理了一下以后方便自己忘了之后能及时找到它

关于UIAlertController .h文件的解析

/**

 关于UIAlertController的解析

 */

#import <UIKit/UIViewController.h>

//

NS_ASSUME_NONNULL_BEGIN

//枚举 UIAlertActionStyle

typedef NS_ENUM(NSInteger, UIAlertActionStyle) {

    UIAlertActionStyleDefault = ,//默认

    UIAlertActionStyleCancel,//取消

    UIAlertActionStyleDestructive//颜色突出的

} NS_ENUM_AVAILABLE_IOS(8_0);

//枚举 UIAlertControllerStyle

typedef NS_ENUM(NSInteger, UIAlertControllerStyle) {

    UIAlertControllerStyleActionSheet = ,//actionSheet// 从底部弹出

    UIAlertControllerStyleAlert//alertView 从中间弹出

} NS_ENUM_AVAILABLE_IOS(8_0);

/* ********************************UIAlertAction********************************/

//aletviewCon的内部模块按钮

NS_CLASS_AVAILABLE_IOS(8_0) @interface UIAlertAction : NSObject <NSCopying>

/**

 *  类方法创建

 *

 *  @param title   标题内容

 *  @param style   action的样式

 *  @param handler 点击后执行的操作block模式

 *

 *  @return

 */

+ (instancetype)actionWithTitle:(nullable NSString *)title style:(UIAlertActionStyle)style handler:(void (^ __nullable)(UIAlertAction *action))handler;

@property (nullable, nonatomic, readonly) NSString *title;

@property (nonatomic, readonly) UIAlertActionStyle style;

//是否可点击

@property (nonatomic, getter=isEnabled) BOOL enabled;

@end

/* ********************************UIAlertController********************************/

NS_CLASS_AVAILABLE_IOS(8_0) @interface UIAlertController : UIViewController

/**

 *  工厂方法创建

 *

 *  @param title          标题

 *  @param message        详细标题

 *  @param preferredStyle 样式

 *

 *  @return

 */

+ (instancetype)alertControllerWithTitle:(nullable NSString *)title message:(nullable NSString *)message preferredStyle:(UIAlertControllerStyle)preferredStyle;

/**

 *  添加按钮

 *

 *  @param action

 */

- (void)addAction:(UIAlertAction *)action;

//按钮数组（）只读的

@property (nonatomic, readonly) NSArray<UIAlertAction *> *actions;

//偏好action，将以后的action设置为偏好action，action的字体会加粗

@property (nonatomic, strong, nullable) UIAlertAction *preferredAction NS_AVAILABLE_IOS(9_0);

//alerviewstyle添加文本框的方法 可在block设置textfield的属性

- (void)addTextFieldWithConfigurationHandler:(void (^ __nullable)(UITextField *textField))configurationHandler;

@property (nullable, nonatomic, readonly) NSArray<UITextField *> *textFields;//装有往弹窗添加的文本框的数组(只读)

@property (nullable, nonatomic, copy) NSString *title;

@property (nullable, nonatomic, copy) NSString *message;

@property (nonatomic, readonly) UIAlertControllerStyle preferredStyle;//样式(只读)

@end

NS_ASSUME_NONNULL_END

使用代码

在button点击事件中

- (IBAction)button:(id)sender {

//    UIAlertController *alertCon = [UIAlertController alertControllerWithTitle:@"提示" message:@"wocao" preferredStyle:UIAlertControllerStyleActionSheet];

    UIAlertController *alertCon = [UIAlertController alertControllerWithTitle:@"提示" message:@"wocao" preferredStyle:UIAlertControllerStyleAlert];

    UIAlertAction *action1 = [UIAlertAction actionWithTitle:@"取消" style:UIAlertActionStyleCancel handler:nil];

    UIAlertAction *action2 = [UIAlertAction actionWithTitle:@"默认" style:UIAlertActionStyleDefault handler:nil];

    UIAlertAction *action3 = [UIAlertAction actionWithTitle:@"不知道" style:UIAlertActionStyleDestructive handler:^(UIAlertAction * _Nonnull action) {

        NSLog(@"wocaodelai ");

    }];

//    action3.enabled = NO;

    [alertCon addAction:action1];

    [alertCon addAction:action2];

    [alertCon addAction:action3];

    alertCon.preferredAction = action3;

    [alertCon addTextFieldWithConfigurationHandler:^(UITextField * _Nonnull textField) {

        textField.textColor = [UIColor redColor];

    }];

    [alertCon addTextFieldWithConfigurationHandler:^(UITextField * _Nonnull textField) {

        textField.textColor = [UIColor yellowColor];

        textField.textAlignment = NSTextAlignmentRight;

    }];

//    NSLog(@"textFields %@", alertCon.textFields);

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

}