在项目中，我们经常会用到alertView。特别是在iOS8之后，采用了UIAlertViewController，每次创建都要写很多重复的代码。为了使用方便将UIAlertViewController与UIAlertView等装成了一个简单的工具类。只需要一句代码就可以实现，采用了UIAlertView的创建方式，非常简单。这里是一个简单的demo。
实现起来很简单：.h文件、
typedef void(^actionBlock)(NSInteger buttonTag);
@interface JCAlertView : NSObject
@property (nonatomic, copy) actionBlock alertBlcok;
@property (nonatomic, copy) actionBlock sheetBlcok;
+ (JCAlertView *)sharedInstance;
/*!
@method 创建提示框
@param viewController 用于显示alert的controller
@param title 标题
@param message 提示内容
@param cancelTitle 取消按钮
@param block 点击按钮的回调
@param otherButtonTitles 按钮
@discussion 取消按钮buttonTag为0,其他按钮按顺序从1开始. iOS8之前buttonTag为系统的buttonIndex.如果取消和其他按钮都为nil则没有操作按钮,传参数时必须以nil结尾，否则会崩溃.
*
*/
- (void)showAlertController:(UIViewController *)viewController
title:(NSString *)title
message:(NSString *)message
cancelTitle:(NSString *)cancelTitle
actionBlock:(actionBlock)block
otherButtonTitles:(NSString *)otherButtonTitles, ... NS_REQUIRES_NIL_TERMINATION;
/*!
@method 创建actionSheet
@param viewController 用于显示actionSheet的controller
@param title 标题
@param message 提示内容
@param cancelTitle 取消按钮
@param block 点击按钮的回调
@param otherButtonTitles 按钮
@param destructive destructive按钮
@discussion 取消按钮buttonTag为0,destructive按钮的buttonTag==-1,其他按钮按顺序从1开始. iOS8之前buttonTag为系统的buttonIndex.如果取消和其他按钮都为nil则没有操作按钮,传参数时必须以nil结尾，否则会崩溃.
*
*/
- (void)showActionSheetController:(UIViewController *)viewController
title:(NSString *)title
message:(NSString *)message
cancelTitle:(NSString *)cancelTitle
destructive:(NSString *)destructive
actionBlock:(actionBlock)block
otherButtonTitles:(NSString *)otherButtonTitles, ... NS_REQUIRES_NIL_TERMINATION;
@end
两个方法，一个是创建alertView一个是创建actionSheet，iOS8之前是用的UIalertView，iOS8之后用UIalertViewController。
具体的实现：alertView
- (void)showAlertController:(UIViewController *)viewController
title:(NSString *)title
message:(NSString *)message
cancelTitle:(NSString *)cancelTitle
actionBlock:(actionBlock)block
otherButtonTitles:(NSString *)otherButtonTitles, ... {
self.alertBlcok = block;
// 读取可变参数里面的titles数组
NSMutableArray *titlesArray = [[NSMutableArray alloc] initWithCapacity:0];
va_list list;
if(otherButtonTitles) {
//1.取得第一个参数的值(即是buttonTitles)
[titlesArray addObject:otherButtonTitles];
//2.从第2个参数开始，依此取得所有参数的值
NSString *otherTitle;
va_start(list, otherButtonTitles);
while ((otherTitle = va_arg(list, NSString*))) {
[titlesArray addObject:otherTitle];
}
va_end(list);
}
if([[[UIDevice currentDevice] systemVersion] floatValue]>=8.0){
[self showAlertController:viewController title:title message:message cancelTilte:cancelTitle otherTitleArray:titlesArray actionBlock:^(NSInteger buttonTag) {
self.alertBlcok(buttonTag);
}];
}else{
UIAlertView *alert = [[UIAlertView alloc] initWithTitle:title message:message delegate:self cancelButtonTitle:cancelTitle otherButtonTitles: nil];
for(NSString *otherTitle in titlesArray){
[alert addButtonWithTitle:otherTitle];
}
[alert show];
}
}
//alert封装
- (void)showAlertController:(UIViewController *)viewController
title:(NSString *)title
message:(NSString *)message
cancelTilte:(NSString *)cancelTitle
otherTitleArray:(NSArray *)otherTitleArray
actionBlock:(actionBlock)block {
UIAlertController *alert = [UIAlertController alertControllerWithTitle:title message:message preferredStyle:UIAlertControllerStyleAlert];
// 下面两行代码 是修改 title颜色和字体的代码
/*
NSAttributedString *attributedMessage = [[NSAttributedString alloc] initWithString:title attributes:@{NSFontAttributeName:[UIFont systemFontOfSize:17.0f], NSForegroundColorAttributeName:[UIColor redColor]}];
[alert setValue:attributedMessage forKey:@"attributedTitle"];
*/
if (cancelTitle) {
// 取消
UIAlertAction *cancelAction = [UIAlertAction actionWithTitle:cancelTitle style:UIAlertActionStyleCancel handler:^(UIAlertAction * _Nonnull action) {
block(0);
}];
[alert addAction:cancelAction];
}
if (otherTitleArray.count>0) {
for (NSInteger i = 0; i<otherTitleArray.count; i++) {
UIAlertAction *otherAction = [UIAlertAction actionWithTitle:otherTitleArray[i] style:UIAlertActionStyleDefault handler:^(UIAlertAction * _Nonnull action) {
block(i+1);
}];
// [action setValue:[UIColor redColor] forKey:@"titleTextColor"]; // 此代码 可以修改按钮颜色
[alert addAction:otherAction];
}
}
[viewController presentViewController:alert animated:YES completion:nil];
}
-(void)alertView:(UIAlertView *)alertView clickedButtonAtIndex:(NSInteger)buttonIndex{
self.alertBlcok(buttonIndex);
}
actionSheet的实现：
- (void)showActionSheetController:(UIViewController *)viewController
title:(NSString *)title
message:(NSString *)message
cancelTitle:(NSString *)cancelTitle
destructive:(NSString *)destructive
actionBlock:(actionBlock)block
otherButtonTitles:(NSString *)otherButtonTitles, ... {
self.sheetBlcok = block;
// 读取可变参数里面的titles数组
NSMutableArray *titlesArray = [[NSMutableArray alloc] initWithCapacity:0];
va_list list;
if(otherButtonTitles) {
//1.取得第一个参数的值(即是buttonTitles)
[titlesArray addObject:otherButtonTitles];
//2.从第2个参数开始，依此取得所有参数的值
NSString *otherTitle;
va_start(list, otherButtonTitles);
while ((otherTitle = va_arg(list, NSString*))) {
[titlesArray addObject:otherTitle];
}
va_end(list);
}
if([[[UIDevice currentDevice] systemVersion] floatValue]){
[self showActionSheetController:viewController title:title message:message cancelTitle:cancelTitle destructive:destructive titlesArray:titlesArray actionBlock:^(NSInteger buttonTag) {
self.sheetBlcok(buttonTag);
}];
}
else{
UIActionSheet *sheet = [[UIActionSheet alloc] initWithTitle:title delegate:self cancelButtonTitle:cancelTitle destructiveButtonTitle:destructive otherButtonTitles:nil];
for(NSString *otherTitle in titlesArray){
[sheet addButtonWithTitle:otherTitle];
}
[sheet showInView:viewController.view];
}
}
// ActionSheet的封装
- (void)showActionSheetController:(UIViewController *)viewController
title:(NSString *)title
message:(NSString *)message
cancelTitle:(NSString *)cancelTitle
destructive:(NSString *)destructive
titlesArray:(NSArray *)titlesArray
actionBlock:(actionBlock)block{
UIAlertController *sheet = [UIAlertController alertControllerWithTitle:title message:message preferredStyle:UIAlertControllerStyleActionSheet];
if (cancelTitle) {
UIAlertAction *cancelAction = [UIAlertAction actionWithTitle:cancelTitle style:UIAlertActionStyleCancel handler:^(UIAlertAction * _Nonnull action) {
self.sheetBlcok(0);
}];
[sheet addAction:cancelAction];
}
if (destructive) {
UIAlertAction *destructiveAction = [UIAlertAction actionWithTitle:destructive style:UIAlertActionStyleDestructive handler:^(UIAlertAction * _Nonnull action) {
self.sheetBlcok(-1);
}];
[sheet addAction:destructiveAction];
}
if (titlesArray.count > 0) {
for (NSInteger i = 0; i<titlesArray.count; i++) {
UIAlertAction *action = [UIAlertAction actionWithTitle:titlesArray[i]
style:UIAlertActionStyleDefault
handler:^(UIAlertAction * _Nonnull action) {
self.sheetBlcok(i+1);
}];
[sheet addAction:action];
}
}
[viewController presentViewController:sheet animated:YES completion:nil];
}
- (void)actionSheet:(UIActionSheet *)actionSheet clickedButtonAtIndex:(NSInteger)buttonIndex{
self.sheetBlcok(buttonIndex);
}
