解析iOS应用的UI开发中懒加载和xib的简单使用方法

YYViewController.m文件代码如下：

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//
//  YYViewController.m
//  10-xib文件的使用
//
//  Created by apple on 14-5-24.
//  Copyright (c) 2014年 itcase. All rights reserved.
//

 

#import "YYViewController.h"
#import "YYapp.h"

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

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@implementation YYViewController

 

//1.加载数据信息
-(NSArray *)app
{
    if (!_app) {
        NSString *path=[[NSBundle mainBundle]pathForResource:@"app.plist" ofType:nil];
        NSArray *temparray=[NSArray arrayWithContentsOfFile:path];
        
        //字典转模型
        NSMutableArray *arrayM=[NSMutableArray array ];
        for (NSDictionary *dict in temparray) {
            [arrayM addObject:[YYapp appWithDict:dict]];
        }
        _app=arrayM;
    }
    return _app;
}

//创建界面原型
- (void)viewDidLoad
{
    [super viewDidLoad];
    NSLog(@"%d",self.app.count);
    
    //九宫格布局
    int totalloc=3;
    CGFloat appviewW=80;
    CGFloat appviewH=90;
    CGFloat margin=(self.view.frame.size.width-totalloc*appviewW)/(totalloc+1);
    
    int count=self.app.count;
    for (int i=0; i<count; i++) {
        
        int row=i/totalloc;
        int loc=i%totalloc;
        CGFloat appviewX=margin + (margin +appviewW)*loc;
        CGFloat appviewY=margin + (margin +appviewH)*row;
        YYapp *app=self.app[i];