iOS开发UI篇—九宫格坐标计算

一、要求

完成下面的布局

二、分析

寻找左边的规律，每一个uiview的x坐标和y坐标。

三、实现思路

(1)明确每一块用得是什么view

(2)明确每个view之间的父子关系，每个视图都只有一个父视图，拥有很多的子视图。

(3)可以先尝试逐个的添加格子，最后考虑使用for循环，完成所有uiview的创建

(4)加载app数据，根据数据长度创建对应个数的格子

(5)添加格子内部的子控件

(6)给内部的子控件装配数据

四、代码示例

//
// YYViewController.m
// 九宫格练习
//
// Created by 孔医己 on 14-5-22.
// Copyright (c) 2014年 itcast. All rights reserved.
//

#import "YYViewController.h"

@interface YYViewController ()
@property(nonatomic,strong)NSArray *apps;
@end

@implementation YYViewController

//1.加载数据
- (NSArray *)apps
{
 if (!_apps) {
 NSString *path=[[NSBundle mainBundle]pathForResource:@"app.plist" ofType:nil];
 _apps=[NSArray arrayWithContentsOfFile:path];
 }
 return _apps;
}

- (void)viewDidLoad
{
 [super viewDidLoad];
 NSLog(@"%d",self.apps.count);

 //2.完成布局设计

 //三列
 int totalloc=3;
 CGFloat appvieww=80;
 CGFloat appviewh=90;

 CGFloat margin=(self.view.frame.size.width-totalloc*appvieww)/(totalloc+1);
 int count=self.apps.count;
 for (int i=0; i<count; i++) {
 int row=i/totalloc;//行号
 //1/3=0,2/3=0,3/3=1;
 int loc=i%totalloc;//列号

 CGFloat appviewx=margin+(margin+appvieww)*loc;
 CGFloat appviewy=margin+(margin+appviewh)*row;

 //创建uiview控件
 UIView *appview=[[UIView alloc]initWithFrame:CGRectMake(appviewx, appviewy, appvieww, appviewh)];
 //[appview setBackgroundColor:[UIColor purpleColor]];
 [self.view addSubview:appview];

 //创建uiview控件中的子视图
 UIImageView *appimageview=[[UIImageView alloc]initWithFrame:CGRectMake(0, 0, 80, 50)];
 UIImage *appimage=[UIImage imageNamed:self.apps[i][@"icon"]];
 appimageview.image=appimage;
 [appimageview setContentMode:UIViewContentModeScaleAspectFit];
 // NSLog(@"%@",self.apps[i][@"icon"]);
 [appview addSubview:appimageview];

 //创建文本标签
 UILabel *applable=[[UILabel alloc]initWithFrame:CGRectMake(0, 50, 80, 20)];
 [applable setText:self.apps[i][@"name"]];
 [applable setTextAlignment:NSTextAlignmentCenter];
 [applable setFont:[UIFont systemFontOfSize:12.0]];
 [appview addSubview:applable];

 //创建按钮
 UIButton *appbtn=[UIButton buttonWithType:UIButtonTypeCustom];
 appbtn.frame= CGRectMake(10, 70, 60, 20);
 [appbtn setBackgroundImage:[UIImage imageNamed:@"buttongreen"] forState:UIControlStateNormal];
 [appbtn setBackgroundImage:[UIImage imageNamed:@"buttongreen_highlighted"] forState:UIControlStateHighlighted];
 [appbtn setTitle:@"下载" forState:UIControlStateNormal];
 appbtn.titleLabel.font=[UIFont systemFontOfSize:12.0];
 [appview addSubview:appbtn];

 [appbtn addTarget:self action:@selector(click) forControlEvents:UIControlEventTouchUpInside];
 }

}

-(void)click
{
 //动画标签
 UILabel *animalab=[[UILabel alloc]initWithFrame:CGRectMake(self.view.center.x-100, self.view.center.y+20, 200, 40)];
 [animalab setText:@"下载成功"];
 animalab.font=[UIFont systemFontOfSize:12.0];
 [animalab setBackgroundColor:[UIColor brownColor]];
 [animalab setAlpha:0];
 [self.view addSubview:animalab];

// [UIView beginAnimations:Nil context:Nil];
// [animalab setAlpha:1];
// [UIView setAnimationDuration:4.0];
// [UIView commitAnimations];

 //执行完之后，还得把这给删除了，推荐使用block动画

 [UIView animateWithDuration:4.0 animations:^{
 [animalab setAlpha:1];
 } completion:^(BOOL finished) {
 //[self.view re];
 }];
}

- (void)didReceiveMemoryWarning
{
 [super didReceiveMemoryWarning];
}

@end

执行效果：