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

//
//  SLViewController.m
//  九宫格算法练习
//
//  Created by Zeng on 14-5-22.
//  Copyright (c) 2014年 github. All rights reserved.
//

#import "SLViewController.h"

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

@implementation SLViewController

/**
 *  懒加载
 *
 *  @return 数据数组
 */
- (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];
    }
    
}

/**
 *  监听按钮点击
 */
-(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 removeFromeSuperview];
    }];
}

@end

执行效果：