简单的自定义AlertView

UIAlertView 在iOS9.0正式被废弃了, 而UIAlertController只有在iOS8.0才能支持, 做项目时不想就这样简单的一个提示还老是再对系统做判断, 所以就自己仿造UIAlertView自定义了一个ZHZAlertView类
并使用block来进行回调

先看效果

1. 接口部分

typedef void(^ConfirmBlock)();typedef void(^CancelBlock)();@interface ZHZAlertView : UIView/** *  自定义初始化 alertView提示框 * *  @param title        标题 *  @param message      信息 *  @param confirmStr   确认按钮 *  @param cancelStr    取消按钮 *  @param confirm      点击确认后操作 *  @param cancel       点击取消按钮后操作 * */- (instancetype)initWithTitle:(NSString *)title message:(NSString *)message confirmAction:(NSString *)confirmStr cancelAction:(NSString *)cancelStr confirmBlock:(ConfirmBlock)confirm cancelBlock:(ConfirmBlock)cancel;/** *  便利构造器 */+ (instancetype)alertViewWithTitle:(NSString *)title message:(NSString *)message confirmAction:(NSString *)confirmStr cancelAction:(NSString *)cancelStr confirmBlock:(ConfirmBlock)confirm cancelBlock:(ConfirmBlock)cancel;/** *  加载并显示视图 */- (void)show;@end

2 . 实现部分

#import "ZHZAlertView.h"#define kMargin ([UIScreen mainScreen].bounds.size.width / 9.0)#define kAlertViewPadding 10#define kScreenW [UIScreen mainScreen].bounds.size.width#define kScreenH [UIScreen mainScreen].bounds.size.height@interface ZHZAlertView ()@property (nonatomic, strong)ConfirmBlock confirmBlock;@property (nonatomic, strong)CancelBlock cancelBlock;///蒙版@property (nonatomic, strong)UIView *backView;///自定义显示的alertView@property (nonatomic, strong)UIView *customAlertView;///标题label@property (nonatomic, strong)UILabel *titleLabel;///信息label@property (nonatomic, strong)UILabel *messageLabel;///点击的按钮segement@property (nonatomic, strong)UISegmentedControl *segemtedControl;///需要提示的当前view, 作为ZHZView的对象的父视图@property (nonatomic, strong)UIView *supView;///标题string@property (nonatomic, strong)NSString *title;///信息string@property (nonatomic, strong)NSString *message;///确认按钮string@property (nonatomic, strong)NSString *confirmStr;///取消按钮string@property (nonatomic, strong)NSString *cancelStr;@end@implementation ZHZAlertView//自定义初始化- (instancetype)initWithTitle:(NSString *)title message:(NSString *)message confirmAction:(NSString *)confirmStr cancelAction:(NSString *)cancelStr confirmBlock:(ConfirmBlock)confirm cancelBlock:(ConfirmBlock)cancel {    if (self = [super init]) {        _title = title;        _message = message;        _confirmStr = confirmStr;        _cancelStr = cancelStr;        _confirmBlock = confirm;        _cancelBlock = cancel;        _supView = [UIApplication sharedApplication].keyWindow;    }    return self;}//构造便利构造器+ (instancetype)alertViewWithTitle:(NSString *)title message:(NSString *)message confirmAction:(NSString *)confirmStr cancelAction:(NSString *)cancelStr confirmBlock:(ConfirmBlock)confirm cancelBlock:(ConfirmBlock)cancel {    return [[ZHZAlertView alloc] initWithTitle:title message:message confirmAction:confirmStr cancelAction:cancelStr confirmBlock:confirm cancelBlock:cancel];}//显示视图- (void)show {    //0. 首先把自己添加到 [UIApplication sharedApplication].keyWindow 上    self.frame = self.supView.frame;    [self.supView addSubview:self];    //1. 蒙版    self.backView = [[UIView alloc] initWithFrame:[UIScreen mainScreen].bounds];    self.backView.backgroundColor = [UIColor colorWithWhite:0.000 alpha:0.414];    [self addSubview:self.backView];    //2. 显示的 alertView    self.customAlertView = [[UIView alloc] initWithFrame:CGRectMake(0, 0, kScreenW - kMargin*3, kScreenH - kMargin *8)];    self.customAlertView.center = self.center;    self.customAlertView.backgroundColor = [UIColor whiteColor];    [self.backView addSubview:self.customAlertView];    self.customAlertView.layer.cornerRadius = 6;    self.customAlertView.layer.masksToBounds = YES;    //2.0 自定义 `提示框` 上的控件    CGFloat customW = CGRectGetWidth(self.customAlertView.frame);    [self.title drawInRect:CGRectMake(0, 0, kScreenW - kMargin*3, kScreenH - kMargin *8) withAttributes:nil];    //2.1 标题 title    self.titleLabel = [[UILabel alloc] initWithFrame:CGRectMake(0, kAlertViewPadding, customW, 20)];    self.titleLabel.textAlignment = NSTextAlignmentCenter;    self.titleLabel.text = self.title;    [self.customAlertView addSubview:self.titleLabel];    CGSize size = CGSizeMake(customW - kAlertViewPadding*2, 0);    NSDictionary *dict = @{                           NSFontAttributeName: [UIFont systemFontOfSize:15]                           };    CGRect frame = [self.message boundingRectWithSize:size options:NSStringDrawingUsesLineFragmentOrigin | NSStringDrawingUsesFontLeading  attributes:dict context:nil];    //2.2 信息 message    CGFloat messageY = CGRectGetMaxY(self.titleLabel.frame) + kAlertViewPadding;    self.messageLabel = [[UILabel alloc] initWithFrame:CGRectMake(kAlertViewPadding, messageY, customW - kAlertViewPadding*2, frame.size.height > 20 ? frame.size.height : 20)];    self.messageLabel.textAlignment = NSTextAlignmentCenter;    self.messageLabel.font = [UIFont systemFontOfSize:13];    self.messageLabel.text = self.message;    self.messageLabel.numberOfLines = 0;    [self.customAlertView addSubview:self.messageLabel];    //2.3 确定 和 取消按钮    CGFloat separatorY = CGRectGetMaxY(self.messageLabel.frame) + kAlertViewPadding*2;    self.segemtedControl = [[UISegmentedControl alloc] initWithItems:@[self.cancelStr, self.confirmStr]];    self.segemtedControl.tintColor = [UIColor grayColor];    self.segemtedControl.frame = CGRectMake(-2, separatorY, customW + 4, 45);    //设置字体属性    NSDictionary *normalDict = @{                                 NSFontAttributeName: [UIFont systemFontOfSize:14],                                 NSForegroundColorAttributeName: [UIColor blackColor],                                 };    //设置正常状态    [self.segemtedControl setTitleTextAttributes:normalDict forState:UIControlStateNormal];    [self.segemtedControl addTarget:self action:@selector(segmentSelect:) forControlEvents:UIControlEventValueChanged];    [self.customAlertView addSubview:self.segemtedControl];    CGFloat selfH = CGRectGetMaxY(self.segemtedControl.frame);    CGRect frame1 = self.customAlertView.frame;    frame1.size.height = selfH - 2;    self.customAlertView.frame = frame1;    //3. 动画显示    [UIView animateWithDuration:0.2 animations:^{        self.customAlertView.center = CGPointMake(self.backView.center.x, self.backView.center.y);    }];}#pragma mark - action- (void)segmentSelect:(UISegmentedControl *)segment {    [UIView animateWithDuration:0.1 animations:^{        self.backView.backgroundColor = [UIColor clearColor];        self.customAlertView.center = self.center;    } completion:^(BOOL finished) {        [self removeFromSuperview];    }];    switch (segment.selectedSegmentIndex) {        case 0:            self.cancelBlock();            break;        case 1:            self.confirmBlock();            break;        default:            break;    }}

3 . 调用

    ZHZAlertView *view = [ZHZAlertView alertViewWithTitle:@"标题" message:@"一直想学PHP\n一直想学H5\n一直想学PYTHON" confirmAction:@"确定" cancelAction:@"取消" confirmBlock:^{        NSLog(@"确定00000");    } cancelBlock:^{        NSLog(@"取消1111");    }];    [view show];

4 . 一些说明:
首先自定义的这个提示框很简单, 并且扩展性很差, 主要用于二选一的场景;
以后根据项目中的需求 肯定会慢慢完善的;
不过有了这个思路, 再进行扩展就很easy了.