本文实例为大家分享了ios通过按钮添加和删除控件,供大家参考,具体内容如下
想要达到的效果如下:
先讲一下这个demo主要部分,即通过按钮实现增删图标
分析:
1、每一个图标需要两个数据,即图片和描述用的字符串 ,所以创建一个item类来封装从plist文件读取出来的数据:
1)plist文件如下:
2)item类:
.h文件
1
2
3
4
5
6
7
8
9
10
11
|
#import <foundation/foundation.h>
@interface item : nsobject
//描述的字符串
@property(nonatomic,copy)nsstring * desstr;
//图片路径
@property(nonatomic,copy)nsstring * imgpath;
-(instancetype)initwithstring:(nsstring *)desstr andimgpath:(nsstring *)imgpath;
@end
|
.m文件
1
2
3
4
5
6
7
8
9
10
11
12
13
14
|
#import "item.h"
@implementation item
-(instancetype)initwithstring:(nsstring *)desstr andimgpath:(nsstring *)imgpath{
self = [super init];
if (self) {
self.desstr = desstr;
self.imgpath = imgpath;
}
return self;
}
@end
|
2、然后创建一个model类用于封装自定义的图标模型,我的模型是将model类继承于uiscrollview类,然后设置其可以滚动,然后再创建一个占据整个scrollview可滚动部分大小的button添加上去。再分别在button上半部分添加uiimageview显示图片,在下半部分添加uilabel显示描述文字,结构如下
重写model的init方法,在创建对象时用item对象初始化:
model类:
1).h文件
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
|
#import <uikit/uikit.h>
#import "item.h"
@interface model : uiscrollview
@property(nonatomic,strong)uibutton *button;
@property(nonatomic,strong)uilabel *label;
//判断button是否被点击
@property(nonatomic,assign) bool isclicked;
-(instancetype)initwithitem:(item *)item;
//重置模型
-( void )resetmodel;
@end
|
2).m文件
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
|
-(instancetype)initwithitem:(item *)item{
self = [super initwithframe:cgrectmake(20, 20, 80, 100)];
if (self) {
//设置模块
self.contentsize = cgsizemake(80, self.frame.size.height * 2);
self.pagingenabled = no;
//设置模块属性
self.button = [[uibutton alloc] initwithframe:cgrectmake(0, 0, self.frame.size.width, self.contentsize.height)];
[self.button addtarget:self action:@selector(buttondidclicked) forcontrolevents:uicontroleventtouchupinside];
//添加图片视图到button上
uiimageview *imgview = [[uiimageview alloc] initwithframe:cgrectmake(0, 0, self.frame.size.width, self.frame.size.height)];
[imgview setimage:[uiimage imagenamed:item.imgpath]];
[self.button addsubview:imgview];
//设置button是否被点击
self.isclicked = no;
[self addsubview:self.button];
self.label = [[uilabel alloc] initwithframe:cgrectmake(0, self.frame.size.height, self.frame.size.width, self.frame.size.height)];
self.label.text = item.desstr;
self.label.font = [uifont systemfontofsize:15];
self.label.textcolor = [uicolor blackcolor];
self.label.numberoflines = 0;
self.label.textalignment = nstextalignmentleft;
[self addsubview:self.label];
}
return self;
}
|
3)button的点击事件:即点击图片文字描述就会从下面升上来,再点击就会降下去的动作:
1
2
3
4
5
6
7
8
9
10
11
12
13
14
|
/label升降
-( void )buttondidclicked{
if (self.isclicked == no) {
[uiview animatewithduration:0.5 animations:^{
self.contentoffset = cgpointmake(0, self.frame.size.height);
}];
self.isclicked = yes;
} else if (self.isclicked == yes) {
[uiview animatewithduration:0.5 animations:^{
self.contentoffset = cgpointmake(0, 0);
}];
self.isclicked = no;
}
}
|
另外,由于必须保证每次添加model到视图上时显示的是图片,所以需要一个方法来复原到初始状态,即一旦从视图上删除就复原:
1
2
3
4
5
|
//复原
-( void )resetmodel{
self.contentoffset = cgpointmake(0, 0);
self.isclicked = no;
}
|
3、模型准备好了,下面在viewcontroller类里面写一个方法将plist文件数据读取出来封装到item对象里面,再用item对象初始化model对象,将所有model对象存入可变数组(_allitems)里面:
1
2
3
4
5
6
7
8
9
10
11
12
13
14
|
//加载数据到物品
-( void )loaddata{
//读取数据
nsstring *filepath = [[nsbundle mainbundle] pathforresource:@ "shop" oftype:@ "plist" ];
nsarray *itemarr = [nsarray arraywithcontentsoffile:filepath];
//创建模型
for ( int i =0;i <[itemarr count] ; i++) {
item *item = [[item alloc] initwithstring:[[itemarr objectatindex:i] objectforkey:@ "title" ] andimgpath:[[itemarr objectatindex:i] objectforkey:@ "pic" ]];
model *model = [[model alloc] initwithitem:item];
//未被添加的为0,添加好的为1
model.tag = 0;
[_allitems addobject:model];
}
}
|
**注意:**model的tag是用于判断model是否已经被添加到视图里面,从而只会添加数组里面未添加的model,已添加的model也会用一个数组(displayeditems)来存储,方便删除
4、添加和删除按钮及其响应的方法:
1)add按钮:
创建:
1
2
3
4
5
|
//添加添加按钮
uibutton *addbutton = [[uibutton alloc] initwithframe:cgrectmake(_width*2/3, _height/10, 40, 40)];
[addbutton setimage:[uiimage imagenamed:@ "add" ] forstate:uicontrolstatenormal];
[addbutton addtarget:self action:@selector(add) forcontrolevents:uicontroleventtouchupinside];
[self.view addsubview:addbutton];
|
add方法:
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
|
//添加事件
-( void )add{
nsinteger itemcount = [_displayeditems count];
for (model* model in _allitems) {
if (model.tag == 0) {
switch (itemcount) {
case 1:
model.frame = cgrectmake(40 + model.frame.size.width, 20, 80, 100);
break ;
case 2:
model.frame = cgrectmake(60 + model.frame.size.width*2, 20, 80, 100);
break ;
case 3:
model.frame = cgrectmake(20,40 + model.frame.size.height, 80, 100);
break ;
case 4:
model.frame = cgrectmake(40 + model.frame.size.width, 40 + model.frame.size.height, 80, 100);
break ;
case 5:
model.frame = cgrectmake(60 + model.frame.size.width*2, 40 + model.frame.size.height, 80, 100);
break ;
default :
break ;
}
[_scrollview addsubview:model];
[_displayeditems addobject:model];
model.tag = 1;
break ;
}
}
}
|
2)delete按钮:
1
2
3
4
5
|
//添加删除按钮
uibutton *deletebutton = [[uibutton alloc] initwithframe: cgrectmake(_width/5, _height/10, 40, 40)];
[deletebutton setimage:[uiimage imagenamed:@ "delete" ] forstate:uicontrolstatenormal];
[deletebutton addtarget:self action:@selector( delete ) forcontrolevents:uicontroleventtouchupinside];
[self.view addsubview:deletebutton];
|
delete方法:
1
2
3
4
5
6
7
|
-( void ) delete {
model *model = _displayeditems.lastobject;
[model removefromsuperview];
model.tag = 0;
[model resetmodel];
[_displayeditems removeobject:model];
}
|
嗯,由于这里为了方便,所以添加控件时的位置判断直接写死了,所以还有待改进。以上就是用按钮添加控件这个demo的主要部分,另外还有那个背景图片的模糊处理使用的是uivisualeffectview类实现的,在此不详述了。
代码不足之处:
1、位置判断写死了
2、模型其实建一个类就够了,item类有点多余
进阶方案:
1、通过拖动图标放置在父视图任何位置
2、点击控件文字显示于图片之上,图片成为背景并虚化
以上就是本文的全部内容,希望对大家的学习有所帮助,也希望大家多多支持服务器之家。
原文链接:https://blog.csdn.net/weixin_42509364/article/details/88317076