iOS開發UI篇—九宮格坐標計算
一、要求
完成下面的布局
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二、分析
尋找左邊的規律，每一個uiview的x坐標和y坐標。
三、實現思路
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(1)明確每一塊用得是什么view
(2)明確每個view之間的父子關系，每個視圖都只有一個父視圖，擁有很多的子視圖。
(3)可以先嘗試逐個的添加格子，最后考慮使用for循環，完成所有uiview的創建
(4)加載app數據，根據數據長度創建對應個數的格子
(5)添加格子內部的子控件
(6)給內部的子控件裝配數據
四、代碼示例
1 // 2 // YYViewController.m3 // 九宮格練習4 // 5 // Created by 孔醫己 on 14-5-22.6 // Copyright (c) 2014年 itcast. All rights reserved.7 // 8 9 #import "YYViewController.h"10 11 @interface YYViewController ()12 @property(nonatomic,strong)NSArray *apps;13 @end14 15 @implementation YYViewController16 17 18 //1.加載數據19 - (NSArray *)apps20 {21 if (!_apps) {22 NSString *path=[[NSBundle mainBundle]pathForResource:@"app.plist" ofType:nil];23 _apps=[NSArray arrayWithContentsOfFile:path];24 }25 return _apps;26 }27 28 - (void)viewDidLoad29 {30 [super viewDidLoad];31 NSLog(@"%d",self.apps.count);32 33 //2.完成布局設計34 35 //三列36 int totalloc=3;37 CGFloat appvieww=80;38 CGFloat appviewh=90;39 40 CGFloat margin=(self.view.frame.size.width-totalloc*appvieww)/(totalloc+1);41 int count=self.apps.count;42 for (int i=0; i<count; i++) {43 int row=i/totalloc;//行號44 //1/3=0,2/3=0,3/3=1;45 int loc=i%totalloc;//列號46 47 CGFloat appviewx=margin+(margin+appvieww)*loc;48 CGFloat appviewy=margin+(margin+appviewh)*row;49 50 51 //創建uiview控件52 UIView *appview=[[UIView alloc]initWithFrame:CGRectMake(appviewx, appviewy, appvieww, appviewh)];53 //[appview setBackgroundColor:[UIColor purpleColor]];54 [self.view addSubview:appview];55 56 57 //創建uiview控件中的子視圖58 UIImageView *appimageview=[[UIImageView alloc]initWithFrame:CGRectMake(0, 0, 80, 50)];59 UIImage *appimage=[UIImage imageNamed:self.apps[i][@"icon"]];60 appimageview.image=appimage;61 [appimageview setContentMode:UIViewContentModeScaleAspectFit];62 // NSLog(@"%@",self.apps[i][@"icon"]);63 [appview addSubview:appimageview];64 65 //創建文本標簽66 UILabel *applable=[[UILabel alloc]initWithFrame:CGRectMake(0, 50, 80, 20)];67 [applable setText:self.apps[i][@"name"]];68 [applable setTextAlignment:NSTextAlignmentCenter];69 [applable setFont:[UIFont systemFontOfSize:12.0]];70 [appview addSubview:applable];71 72 //創建按鈕73 UIButton *appbtn=[UIButton buttonWithType:UIButtonTypeCustom];74 appbtn.frame= CGRectMake(10, 70, 60, 20);75 [appbtn setBackgroundImage:[UIImage imageNamed:@"buttongreen"] forState:UIControlStateNormal];76 [appbtn setBackgroundImage:[UIImage imageNamed:@"buttongreen_highlighted"] forState:UIControlStateHighlighted];77 [appbtn setTitle:@"下載" forState:UIControlStateNormal];78 appbtn.titleLabel.font=[UIFont systemFontOfSize:12.0];79 [appview addSubview:appbtn];80 81 [appbtn addTarget:self action:@selector(click) forControlEvents:UIControlEventTouchUpInside];82 }83 84 }85 86 -(void)click87 {88 //動畫標簽89 UILabel *animalab=[[UILabel alloc]initWithFrame:CGRectMake(self.view.center.x-100, self.view.center.y+20, 200, 40)];90 [animalab setText:@"下載成功"];91 animalab.font=[UIFont systemFontOfSize:12.0];92 [animalab setBackgroundColor:[UIColor brownColor]];93 [animalab setAlpha:0];94 [self.view addSubview:animalab];95 96 // [UIView beginAnimations:Nil context:Nil];97 // [animalab setAlpha:1];98 // [UIView setAnimationDuration:4.0];99 // [UIView commitAnimations]; 100 101 //執行完之后，還得把這給刪除了，推薦使用block動畫 102 103 [UIView animateWithDuration:4.0 animations:^{ 104 [animalab setAlpha:1]; 105 } completion:^(BOOL finished) { 106 //[self.view re]; 107 }]; 108 } 109 110 - (void)didReceiveMemoryWarning 111 { 112 [super didReceiveMemoryWarning]; 113 } 114
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執行效果：
——總結)
![[C++] Nested Radical Constant](http://pic.xiahunao.cn/[C++] Nested Radical Constant)
