ios上弹提示框的简单设计

先看效果

QQ.png

做法

新建一个类，继承自UIView。
在.h文件中，

@interface PDmidTipView : UIView

@property(nonatomic,strong)NSString *text;

-(void)show;   // 显示

@end

在.m 文件中
子控件的声明

@interface PDmidTipView()

@property(nonatomic,weak)UILabel *titleLb;   // 标题

@property(nonatomic,weak)UILabel *textLb;   // 具体内容

@property(nonatomic,weak)UIButton *finshBtn;   // 确定按钮

@property(nonatomic,strong)UIView *cover;   // 蒙版view

@end

懒加载cover

-(UIView *)cover{
    if(!_cover){
        _cover = [[UIView alloc] initWithFrame:CGRectMake(0, 0, screenW, screenH)];
        _cover.backgroundColor = LineColor;
        UITapGestureRecognizer *tap = [[UITapGestureRecognizer alloc] initWithTarget:self action:@selector(clickCoverView)];
        [_cover addGestureRecognizer:tap];  //给蒙版添加手势
    }
    return _cover;
}

创建方法

-(instancetype)initWithFrame:(CGRect)frame{
    
    if(self = [super initWithFrame:frame]){
        self.backgroundColor = [UIColor whiteColor];
        
        UILabel *lb0 = [[UILabel alloc] Label_color3:Font18 text:@"推荐理由"];
        [self addSubview:lb0];
        _titleLb = lb0;
        
        UILabel *lb = [[UILabel alloc] Label_color8:Font16 text:nil];
        lb.numberOfLines = 0;
        [self addSubview:lb];
        _textLb = lb;
        
        UIButton *btn = [[UIButton alloc] buttonOfRed:@"完成" font:Font18];
        [btn setBackgroundColor:Color_red];
        [btn.layer setCornerRadius:0.0];
        [self addSubview:btn];
        _finshBtn = btn;
        [_finshBtn addTarget:self action:@selector(clickFinish) forControlEvents:UIControlEventTouchUpInside];
        
        float h = screenH == 812?65:45;
        _finshBtn.frame = CGRectMake(0, self.frame.size.height - h, screenW, h);
        
        [_titleLb mas_makeConstraints:^(MASConstraintMaker *make) {
            make.centerX.equalTo(self.mas_centerX);
            make.top.equalTo(self.mas_top).offset(20);
            make.height.equalTo(@18);
        }];
        
        [_textLb mas_makeConstraints:^(MASConstraintMaker *make) {
            make.top.equalTo(_titleLb.mas_bottom).offset(40);
            make.left.equalTo(self.mas_left).offset(20);
            make.right.equalTo(self.mas_right).offset(-20);
        }];   
    }   
    return self;
}

事件处理

//--点击完成按钮
-(void)clickFinish{
    [self dismiss];   //消失
}

//--点击蒙版
-(void)clickCoverView{
    [self dismiss];   //消失
}

显示与消失的实现（动画效果）

-(void)show{
    
    self.center = CGPointMake(screenW/2 , screenH*1.5);
    
    UIWindow *window = [UIApplication sharedApplication].keyWindow;
    [window addSubview:self.cover];
    [window addSubview:self];
    
    [UIView animateWithDuration:0.5 animations:^{
        
        self.center = CGPointMake(screenW/2 , screenH*0.65);
    } completion:^(BOOL finished) {
        //NSLog(@"所有动画之行完毕");
    }];
    
}

- (void)dismiss {
    
    [UIView animateWithDuration:0.5 animations:^{
        
        self.center = CGPointMake(screenW/2 , screenH*1.5);
        
    } completion:^(BOOL finished) {
        
        [self removeFromSuperview];
        [_cover removeFromSuperview];
    }];
}