iOS 简单封装一个可以自定义内容的AlertView的界面

//
//  BTBaseAlertView.h
//  Test
//
//  Created by liuyinghui on 2018/8/22.
//  Copyright © 2018年 liuyinghui. All rights reserved.
//

#import <UIKit/UIKit.h>

@interface BTBaseAlertView : UIView

@property (strong, nonatomic) UIView *contentView;

- (void)show;

- (void)hide;

@end

//
//  BTBaseAlertView.m
//  Test
//
//  Created by liuyinghui on 2018/8/22.
//  Copyright © 2018年 liuyinghui. All rights reserved.
//

#import "BTBaseAlertView.h"

@interface BTBaseAlertView ()
@property (strong, nonatomic) UIView *backgroundView;
@end

@implementation BTBaseAlertView

- (instancetype)init {
    if (self = [super initWithFrame:[UIScreen mainScreen].bounds]) {
        self.backgroundColor = [UIColor clearColor];
        
        _backgroundView = [[UIView alloc] initWithFrame:self.frame];
        _backgroundView.backgroundColor = [UIColor blackColor];
        [self addSubview:_backgroundView];
    }
    return self;
}

- (void)show {
    UIWindow *window = [[UIApplication sharedApplication] keyWindow];
    NSArray *windowViews = [window subviews];
    if(windowViews && [windowViews count] > 0){
        UIView *subView = [windowViews objectAtIndex:[windowViews count]-1];
        for(UIView *aSubView in subView.subviews)
        {
            [aSubView.layer removeAllAnimations];
        }
        [subView addSubview:self];
        [self showBackground];
        [self showAlertAnimation];
    }
}


- (void)hide {
    _contentView.hidden = YES;
    [self hideAlertAnimation];
    [self removeFromSuperview];
}

- (void)setContentView:(UIView *)contentView {
    _contentView = contentView;
    _contentView.center = self.center;
    [self addSubview:_contentView];
}

- (void)showBackground
{
    _backgroundView.alpha = 0;
    [UIView beginAnimations:@"fadeIn" context:nil];
    [UIView setAnimationDuration:0.35];
    _backgroundView.alpha = 0.4;
    [UIView commitAnimations];
}

-(void)showAlertAnimation
{
    CAKeyframeAnimation * animation;
    animation = [CAKeyframeAnimation animationWithKeyPath:@"transform"];
    animation.duration = 0.30;
    animation.removedOnCompletion = YES;
    animation.fillMode = kCAFillModeForwards;
    NSMutableArray *values = [NSMutableArray array];
    [values addObject:[NSValue valueWithCATransform3D:CATransform3DMakeScale(0.9, 0.9, 1.0)]];
    [values addObject:[NSValue valueWithCATransform3D:CATransform3DMakeScale(1.1, 1.1, 1.0)]];
    [values addObject:[NSValue valueWithCATransform3D:CATransform3DMakeScale(1.0, 1.0, 1.0)]];
    animation.values = values;
    [_contentView.layer addAnimation:animation forKey:nil];
}

- (void)hideAlertAnimation {
    [UIView beginAnimations:@"fadeIn" context:nil];
    [UIView setAnimationDuration:0.35];
    _backgroundView.alpha = 0.0;
    [UIView commitAnimations];
}

//点击屏幕空白处去掉键盘
- (void)touchesEnded:(NSSet<UITouch *> *)touches withEvent:(UIEvent *)event
{
    if ([touches anyObject].view != _contentView) {
        // 判断点击的区域如果不是菜单按钮_btnMenu, 则关闭菜单
        [self hide];
    }
}
@end

使用方法

    BTBaseAlertView *alert = [[BTBaseAlertView alloc] init];
    UIView *contentView = [[UIView alloc] initWithFrame:CGRectMake(0, 0, 200, 200)];
    [contentView setBackgroundColor:[UIColor greenColor]];
    alert.contentView = contentView;
    UIButton *btn = [[UIButton alloc] initWithFrame:CGRectMake(0, 0, 50, 20)];
    [btn setBackgroundColor:[UIColor redColor]];
    [btn addTarget:self action:@selector(btnPress:) forControlEvents:UIControlEventTouchUpInside];
    [contentView addSubview:btn];
    [alert show];