UIAlertViewController类在iOS开发中经常使用,但是使用系统方法需要太多的代码,所以我自己封装了一个类。在一个block中实现点击事件。
- UIAlertController+Category.h
#import <UIKit/UIKit.h>
typedef void (^CallBackBlock)(NSInteger btnIndex);
@interface UIAlertController (Category)
/**
自定义封装的UIAlertController方法
@param viewController 显示的vc
@param alertControllerStyle UIAlertControllerStyle 样式
@param title 标题
@param message 提示信息
@param block 回调block
@param cancelBtnTitle 取消button标题
@param destructiveBtnTitle 红色的按钮
@param otherBtnTitles 其他button标题
*/
+ (void)showAlertCntrollerWithViewController:(UIViewController*)viewController alertControllerStyle:(UIAlertControllerStyle)alertControllerStyle title:(NSString*)title message:(NSString*)message CallBackBlock:(CallBackBlock)block cancelButtonTitle:(NSString *)cancelBtnTitle
destructiveButtonTitle:(NSString *)destructiveBtnTitle
otherButtonTitles:(NSString *)otherBtnTitles,...NS_REQUIRES_NIL_TERMINATION;
@end
- UIAlertController+Category.h
#import "UIAlertController+Category.h"
@implementation UIAlertController (Category)
+(void)showAlertCntrollerWithViewController:(UIViewController *)viewController alertControllerStyle:(UIAlertControllerStyle)alertControllerStyle title:(NSString *)title message:(NSString *)message CallBackBlock:(CallBackBlock)block cancelButtonTitle:(NSString *)cancelBtnTitle destructiveButtonTitle:(NSString *)destructiveBtnTitle otherButtonTitles:(NSString *)otherBtnTitles, ...
{
UIAlertController * alertController = [UIAlertController alertControllerWithTitle:title message:message preferredStyle:alertControllerStyle];
//添加按钮
if (cancelBtnTitle.length) {
UIAlertAction * cancelAction = [UIAlertAction actionWithTitle:cancelBtnTitle style:UIAlertActionStyleCancel handler:^(UIAlertAction * _Nonnull action) {
block(0);
}];
[alertController addAction:cancelAction];
}
if (destructiveBtnTitle.length) {
UIAlertAction * destructiveAction = [UIAlertAction actionWithTitle:destructiveBtnTitle style:UIAlertActionStyleDestructive handler:^(UIAlertAction * _Nonnull action) {
block(1);
}];
[alertController addAction:destructiveAction];
}
if (otherBtnTitles.length) {
UIAlertAction *otherActions = [UIAlertAction actionWithTitle:otherBtnTitles style:UIAlertActionStyleDefault handler:^(UIAlertAction *action) {
(!cancelBtnTitle.length && !destructiveBtnTitle.length) ? block(0) : (((cancelBtnTitle.length && !destructiveBtnTitle.length) || (!cancelBtnTitle.length && destructiveBtnTitle.length)) ? block(1) : block(2));
}];
[alertController addAction:otherActions];
/**
* va_list : (1)首先在函数里定义一具VA_LIST型的变量,这个变量是指向参数的指针;
* (2)然后用VA_START宏初始化变量刚定义的VA_LIST变量;
* (3)然后用VA_ARG返回可变的参数,VA_ARG的第二个参数是你要返回的参数的类型(如果函数有多个可变参数的,依次调用VA_ARG获取各个参数);
* (4)最后用VA_END宏结束可变参数的获取。
* va_start :获取可变参数列表的第一个参数的地址;
* va_arg :获取当前参数,返回指定类型并将指针指向下一参数
* va_end :清空va_list可变参数列表:
*
*
*/
va_list args;
va_start(args, otherBtnTitles);
if (otherBtnTitles.length) {
NSString * otherString;
int index = 2;
(!cancelBtnTitle.length && !destructiveBtnTitle.length) ? (index = 0) : ((cancelBtnTitle.length && !destructiveBtnTitle.length) || (!cancelBtnTitle.length && destructiveBtnTitle.length) ? (index = 1) : (index = 2));
while ((otherString = va_arg(args, NSString*))) {
index ++ ;
UIAlertAction * otherActions = [UIAlertAction actionWithTitle:otherString style:UIAlertActionStyleDefault handler:^(UIAlertAction * _Nonnull action) {
block(index);
}];
[alertController addAction:otherActions];
}
}
va_end(args);
}
[viewController presentViewController:alertController animated:YES completion:nil];
}
@end
其实主要的难点就是循环获取otherButtons,代码中有详细的介绍,不足之处希望大家指正。想要了解更多或者下载demo,请访问github:https://github.com/Maricle1/ControlsPackage.git