详解iOS应用UI开发中的九宫格坐标计算与字典转换模型

viewcontroller.m文件代码（字典转模型）
#import "lfviewcontroller.h"
#import "lfappinfo.h"

@interface lfviewcontroller ()
@property (nonatomic, strong) nsarray *applist;
@end

@implementation lfviewcontroller

// 字典转模型
– (nsarray *)applist
{
if (!_applist) {
// 1. 从mainbundle加载
nsbundle *bundle = [nsbundle mainbundle];
nsstring *path = [bundle pathforresource:@"app.plist" oftype:nil];
// _applist = [nsarray arraywithcontentsoffile:path];

nsarray *array = [nsarray arraywithcontentsoffile:path];
// 将数组转换成模型，意味着self.applist中存储的是lfappinfo对象
// 1. 遍历数组，将数组中的字典依次转换成appinfo对象，添加到一个临时数组
// 2. self.applist = 临时数组

nsmutablearray *arraym = [nsmutablearray array];
for (nsdictionary *dict in array) {
//用字典来实例化对象的工厂方法
[arraym addobject:[lfappinfo appinfowithdict:dict]];
}

_applist = arraym;
}
return _applist;
}

– (void)viewdidload
{
[super viewdidload];

// 总共有3列
int totalcol = 3;
cgfloat vieww = 80;
cgfloat viewh = 90;

cgfloat marginx = (self.view.bounds.size.width – totalcol * vieww) / (totalcol + 1);
cgfloat marginy = 10;
cgfloat starty = 20;

for (int i = 0; i < self.applist.count; i++) {

int row = i / totalcol;
int col = i % totalcol;

cgfloat x = marginx + (vieww + marginx) * col;
cgfloat y = starty + marginy + (viewh + marginy) * row;

uiview *appview = [[uiview alloc] initwithframe:cgrectmake(x, y, vieww, viewh)];

[self.view addsubview:appview];

// 创建appview内部的细节
// 0> 读取数组中的appinfo
// nsdictionary *dict = self.applist[i];
lfappinfo *appinfo = self.applist[i];

// 1> uiimageview
uiimageview *imageview = [[uiimageview alloc] initwithframe:cgrectmake(0, 0, vieww, 50)];
imageview.image = appinfo.image;
imageview.contentmode = uiviewcontentmodescaleaspectfit;

[appview addsubview:imageview];

// 2> uilabel
uilabel *label = [[uilabel alloc] initwithframe:cgrectmake(0, imageview.bounds.size.height, vieww, 20)];
// 设置文字
label.text = appinfo.name;
label.font = [uifont systemfontofsize:12.0];
label.textalignment = nstextalignmentcenter;

[appview addsubview:label];

// 3> uibutton
// uibuttontypecustom和[[uibutton alloc] init]是等价的
uibutton *button = [uibutton buttonwithtype:uibuttontypecustom];
button.frame = cgrectmake(15, 70, vieww – 30, 20);

[button settitle:@"下载" forstate:uicontrolstatenormal];
button.titlelabel.font= [uifont systemfontofsize:14.0];

[button setbackgroundimage:[uiimage imagenamed:@"buttongreen"] forstate:uicontrolstatenormal];
[button setbackgroundimage:[uiimage imagenamed:@"buttongreen_highlighted"] forstate:uicontrolstatehighlighted];

[appview addsubview:button];
button.tag = i;

[button addtarget:self action:@selector(downloadclick:) forcontrolevents:uicontroleventtouchupinside];
}
}

– (void)downloadclick:(uibutton *)button
{
nslog(@"%d", button.tag);
// 实例化一个uilabel显示在视图上，提示用户下载完成
uilabel *label = [[uilabel alloc] initwithframe:cgrectmake(80, 400, 160, 40)];
label.textalignment = nstextalignmentcenter;
label.backgroundcolor = [uicolor lightgraycolor];

lfappinfo *appinfo = self.applist[button.tag];
label.text = [nsstring stringwithformat:@"下载%@完成", appinfo.name];
label.font = [uifont systemfontofsize:13.0];
label.alpha = 1.0;
[self.view addsubview:label];

// 动画效果
// 动画效果完成之后，将label从视图中删除
// 首尾式动画，只能做动画，要处理完成后的操作不方便
// [uiview beginanimations:nil context:nil];
// [uiview setanimationduration:1.0];
// label.alpha = 1.0;
// [uiview commitanimations];

// block动画比首尾式动画简单，而且能够控制动画结束后的操作
// 在ios中，基本都使用首尾式动画
[uiview animatewithduration:2.0 animations:^{
label.alpha = 0.0;
} completion:^(bool finished) {
// 删除label
[label removefromsuperview];
}];
}

@end

模型.h文件代码