1.png
如图，如果要在点击按钮的时候出现一个弹框。
gif.gif
我们需要做的就是，获取这个点 在 window上的位置。 把弹框加到window上，当然 背景色为白色，效果就像弹框出现在当前页面。
关乎 坐标系转换，参考文章：坐标转换
LxButton *button = [LxButton LXButtonWithTitle:@"请选择车牌号" titleFont:Font(14) Image:nil backgroundImage:nil backgroundColor:[UIColor blueColor] titleColor:[UIColor blackColor] frame:CGRectMake(20, 100, 100, 40)];
[self.tempView addSubview:button];
//获取window
UIWindow *window =[UIApplication sharedApplication].windows.lastObject;
NSLog(@"%@",[UIApplication sharedApplication].windows);
//把 当前点 转换到window上
CGPoint point = [window convertPoint:CGPointMake(button.frame.origin.x, button.frame.origin.y+ button.frame.size.height) fromView:self.tempView];
self.dropView =[[LXDropView alloc]initWithTitleArray:@[@"国家经济见附件啊",@"噶个人；人孔盖看看",@"噶人看过卡"] orignPoint:point listWidth:Device_Width/2 selectResult:^(NSInteger index) {
}];
NCWS(weakSelf);
[button addClickBlock:^(UIButton *button) {
[weakSelf.dropView show];
}];
代码如下：
#import <UIKit/UIKit.h>
@interface LXDropView : UIView
-(instancetype)initWithTitleArray:(NSArray *)titleA orignPoint:(CGPoint)orginPoint listWidth:(CGFloat)listWidth selectResult:(void (^)(NSInteger index))selectResult;
-(void)show;
@end
#import "LXDropView.h"
#import "LXDropListCell.h"
#define ROWHEIGHT 44
@interface LXDropView()<UITableViewDelegate,UITableViewDataSource>
@property(nonatomic,assign)CGPoint orignPoint;
@property(nonatomic,assign)CGFloat listWidth;
@property(nonatomic,copy)void (^selectResult)(NSInteger index);
@property(nonatomic,strong)NSArray *titleA;
@property(nonatomic,strong)UITableView *listView;
@end
@implementation LXDropView
-(instancetype)initWithTitleArray:(NSArray *)titleA orignPoint:(CGPoint)orginPoint listWidth:(CGFloat)listWidth selectResult:(void (^)(NSInteger))selectResult{
self = [super init];
if (self) {
self.orignPoint = orginPoint;
//超出屏幕宽度的判断
if (listWidth + self.orignPoint.x >= [UIScreen mainScreen].bounds.size.width) {
listWidth = [UIScreen mainScreen].bounds.size.width;
}
self.listWidth = listWidth;
self.selectResult = selectResult;
self.titleA = titleA;
self.frame = [UIScreen mainScreen].bounds;
self.backgroundColor =[UIColor clearColor];
[self setUp];
[self.listView reloadData];
}
return self;
}
-(void)setUp{
[self addSubview:self.listView];
}
-(void)show{
UIWindow *keyWindow = [UIApplication sharedApplication].windows.lastObject;
[keyWindow addSubview:self];
[self creatAnimaiton];
}
-(void)creatAnimaiton{
self.listView.alpha = 0.f;
self.listView.transform = CGAffineTransformMakeScale(0.1f, 0.1f);
[UIView animateWithDuration:0.2f delay:0.f options:UIViewAnimationOptionCurveEaseInOut animations:^{
self.listView.transform = CGAffineTransformMakeScale(1.05f, 1.05f);
self.listView.alpha = 1.f;
} completion:^(BOOL finished) {
[UIView animateWithDuration:0.08f delay:0.f options:UIViewAnimationOptionCurveEaseInOut animations:^{
self.listView.transform = CGAffineTransformIdentity;
} completion:nil];
}];
}
-(void)dismiss{
[UIView animateWithDuration:0.3f animations:^{
self.listView.transform = CGAffineTransformMakeScale(0.1f, 0.1f);
self.listView.alpha = 0.f;
} completion:^(BOOL finished) {
[self removeFromSuperview];
}];
}
-(NSInteger)tableView:(UITableView *)tableView numberOfRowsInSection:(NSInteger)section{
return self.titleA.count;
}
-(UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath{
LXDropListCell *cell =[tableView dequeueReusableCellWithIdentifier:@"cell" forIndexPath:indexPath];
if (!cell) {
cell =[[LXDropListCell alloc]initWithStyle:UITableViewCellStyleDefault reuseIdentifier:@"cell"];
}
cell.contentLabel.text = self.titleA[indexPath.row];
return cell;
}
-(UITableView *)listView{
if (!_listView) {
_listView =[[UITableView alloc]initWithFrame:CGRectMake(self.orignPoint.x, self.orignPoint.y, self.listWidth, self.titleA.count * ROWHEIGHT) style:UITableViewStylePlain];
_listView.delegate = self;
_listView.dataSource = self;
_listView.showsVerticalScrollIndicator = NO;
_listView.showsHorizontalScrollIndicator = NO;
_listView.rowHeight = ROWHEIGHT;
[_listView registerNib:[UINib nibWithNibName:@"LXDropListCell" bundle:nil] forCellReuseIdentifier:@"cell"];
_listView.layer.cornerRadius =3;
_listView.layer.masksToBounds = YES;
}
return _listView;
}
-(void)tableView:(UITableView *)tableView didSelectRowAtIndexPath:(NSIndexPath *)indexPath{
[tableView deselectRowAtIndexPath:indexPath animated:YES];
if (self.selectResult) {
self.selectResult(indexPath.row);
[self dismiss];
}
}
//-(void)touchesBegan:(NSSet<UITouch *> *)touches withEvent:(UIEvent *)event{
// UITouch *touch =[touches anyObject];
//
// CGPoint point = [touch locationInView:self];
// point = [self.listView.layer convertPoint:point fromLayer:self.layer];
// if ([self.listView.layer containsPoint:point] ) {
//
// }else{
//// [self dismiss];
// [self removeFromSuperview];
//
// }
//
//}
@end
demo地址：漫漫的demo
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