弹出视图

开发时经常会遇到一些，在点击某个按钮弹出一个视图，视图浮于现视图的上面的情形，总结一下：

思路：

1.自定义一个view,比如叫popView，它继承于UIView而创建，popView即弹出视图，在这个自定义的popView里面，可以写入弹出视图里面的一些内容。

2.由于这个弹出视图是由于某个Controller里面的某个按钮触发的方法实现的，所以在触发的方法里面，实现这个视图的创建。

3.另外，特别注意，弹出视图上还应有个按钮，点击这个按钮，弹出视图则消失了，由于这个按钮是在自定义的popView中添加的，而这个按钮触发的使得这个弹出视图消失的方法，却无法在这里面实现，所以可以通过一个代理方法实现，即：popView是委托方，Controller是代理方，当popView中的按钮被点击了时，Controller就将这个弹出视图移除掉。

代码如下:

//PopupView的.h文件
@protocol popupDelegate <NSObject>

- (void)popUpRemove;//点击弹出视图的按钮时触发的使得弹出视图消失的方法

@end

@interface PopupView : UIView

@property (nonatomic,assign) id<popupDelegate>delegate;

@end

#import "PopupView.h"//PopupView的.m文件

@implementation PopupView

- (id)initWithFrame:(CGRect)frame
{
self = [super initWithFrame:frame];
if (self) {
self.backgroundColor = [UIColor whiteColor];

//        self.center = self.superview.center;
CGRect bounds = [[UIScreen mainScreen]bounds];

UILabel *label = [[UILabel alloc]initWithFrame:CGRectMake(self.frame.origin.x, self.frame.origin.y+5, self.frame.size.width/3, 20)];
label.text = @"说明";
label.font = [UIFont systemFontOfSize:15];

[self addSubview:label];

UIButton *backBtn = [[UIButton alloc]initWithFrame:CGRectMake(self.frame.origin.x+200, self.frame.origin.y+5,15,15)];
[backBtn setBackgroundImage:[UIImage imageNamed:@"xiao"] forState:UIControlStateNormal];
[backBtn addTarget:self action:@selector(back:) forControlEvents:UIControlEventTouchUpInside];
[self addSubview:backBtn];
}
return self;
}

- (void)back:(UIButton *)sender
{
if (self.delegate && [self.delegate respondsToSelector:@selector(popUpGoTo)]) {

[self.delegate popUpGoTo];
}
}

import “QuotedListViewController.h”

import “AFNetworking.h”

import “QuotedListTableViewCell.h”

import “OrderModel.h”

import “MyNavigationButton.h”

import “PopupView.h”

define key_productId @”productId”//商品ID

define key_productName @”productName”

define key_publishCount @”publishCount”

define key_count @”count”

define key_price @”price”

@interface QuotedListViewController (){

PopupView *_infoView;

NSMutableArray *dataArray; //加入了用于保存数组的数组 dataArray

//保存每次修改的数据；

NSMutableArray *_sendArray;

NSArray *_keyArray;

}

import “ViewController.h”

import “PopupView.h”

@interface QuotedListViewController (){

PopupView *_infoView;

}

(void)viewDidLoad {

[super viewDidLoad];

UIButton *btn = [[UIButton alloc]initWithFrame:CGRectMake(100, 100, 50, 50)];

[btn setTitle:@”弹出视图按钮” forState:UIControlStateNormal];

btn.titleLabel.font = [UIFont systemFontOfSize:20];

[btn addTarget:self action:@selector(popUp:) forControlEvents:UIControlEventTouchUpInside];

[self.view addSubview:btn];

}

(void)popUp:(UIButton *)sender

{

if (_infoView == nil) {

CGRect bounds = [[UIScreen mainScreen]bounds];

self.view.alpha = 0.5f;

_infoView= [[PopupView alloc]initWithFrame:CGRectMake(bounds.origin.x, bounds.origin.y, 230, 260)];
_infoView.delegate = self;
CGPoint centerPoint=CGPointMake(self.view.center.x, 300);

_infoView.center = centerPoint;
[[UIApplication sharedApplication].keyWindow addSubview:_infoView];//加到主窗口上面

}else

{self.view.alpha = 0.5f;

[[UIApplication sharedApplication].keyWindow addSubview:_infoView];

}

}

pragma mark 代理实现方法

(void)popUpRemove

{

if (_infoView.superview) {

self.view.alpha = 1.0f;

[_infoView removeFromSuperview];//视图从父视图移除 （如果_infoView的父视图存在，就将它从父视图中移除）

}

}