ios分层设计 野指针问题

把昨天代码重构了下分层

Xcode6.2没有直接生成两个文件的class操作 仔细寻找后找到 新建 new file -> Source -> Cocoa Touch Class 直接生成一个h和一个m俩文件

事先将xib建好

新建纯净view 自定义xib class为RowView

xib里面去掉layou out 选择freestate 来更高宽高属性 拖放两个按钮一个文本标签

分别给予tag赋值1.2.3

//
//  RowView.h
//  08-通讯录
//
//  Created by zjj on 15/5/12.
//  Copyright (c) 2015年 zjj. All rights reserved.
//

#import <UIKit/UIKit.h>

@interface RowView : UIView
+ (id)rowViewWithIcon :(NSString *)icon name :(NSString *)name;
@end

//
//  RowView.m
//  08-通讯录
//
//  Created by zjj on 15/5/12.
//  Copyright (c) 2015年 zjj. All rights reserved.
//

#import "RowView.h"

@implementation RowView
+ (id)rowViewWithIcon:(NSString *)icon name:(NSString *)name
{
  RowView *view = [[NSBundle mainBundle]loadNibNamed:@"RowView" owner:nil options:nil][0];
    UIButton *btnIcon = (UIButton *)[view viewWithTag:1];
    [btnIcon setImage:[UIImage imageNamed:icon] forState:UIControlStateNormal];
    UILabel *labName = (UILabel *)[view viewWithTag:2];
    labName.text = name;
    return view;
}
@end

ViewController.m局部代码

#import "RowView.h"
#pragma mark 用自定义xib创建一行view并添加文字和头像
- (UIView *)createRowView
{
    NSString *iconNames = [NSString stringWithFormat:@"0%d.jpg",arc4random_uniform(9)];
    NSString *name = _allNames[arc4random_uniform((int)_allNames.count)];
    RowView *rowView = [RowView rowViewWithIcon:iconNames  name:name];
    return rowView;
}

ViewController.m全代码文件

//
//  ViewController.m
//  08-通讯录
//
//  Created by zjj on 15/5/10.
//  Copyright (c) 2015年 zjj. All rights reserved.
//

#import "ViewController.h"
#import "RowView.h"
#define kDuation 0.5
#define kRowH 50
#define kNameTag 10
//类扩展 （class extension 匿名分类）用于扩展 内部可以声明本类全局引用私有变量
@interface ViewController ()
{
    CGFloat _rowY ;
    NSArray *_allNames; // 苹果官方规则成员变量必须以下划线开头
}
@end

@implementation ViewController
#pragma mark 控制器的view加载完毕的时候调用一次
- (void)viewDidLoad
{
    [super viewDidLoad];
    _allNames = @[@"加菲猫吃饭",@"加菲猫打瞌睡",@"加菲猫喝茶",@"加菲猫乘地铁",@"加菲猫敲代码",@"加菲猫打电话",@"加菲猫听音乐",@"加菲猫起床",@"加菲猫奶孩子"];

}
#pragma mark 添加一行
- (IBAction)add:(UIBarButtonItem *)sender {
    // 0取出最后一个子控件
    UIView *lastView = [self.view.subviews lastObject];
    // 这行的Y =  最后一个控件的Y值+控件的高度+间距
    _rowY = lastView.frame.origin.y + lastView.frame.size.height + 5;
    // 创建一行
    UIView *rowView = [self createRowView];
    NSLog(@"%@",rowView);
    // 添加一行到控制器view中
    [self.view addSubview:rowView];
    _removes.enabled = YES;// 启用删除
    // 设置动画开始前的控件属性
    rowView.frame = CGRectMake(375, _rowY, 375, 50);
    rowView.alpha = 0;// 设置透明度
    // 执行动画
    [UIView animateWithDuration:kDuation animations:^{
        // 改变控件属性
        rowView.frame = CGRectMake(0, _rowY, 375, 50);
        rowView.alpha = 1;
    }];
}
#pragma mark 创建一行 添加头像和文字
//- (UIView *)createRowView
//{
//    // 1.添加父控件
//    UIView *rowView = [[UIView alloc]init];
//    rowView.frame = CGRectMake(0, _rowY, 375, 50);
//    rowView.backgroundColor  = [UIColor whiteColor];
//    // 2.添加文字
//    UILabel *name = [[UILabel alloc]init];
//    name.frame = CGRectMake(0, 0, self.view.frame.size.width, kRowH);
//    name.text = _allNames[arc4random_uniform((int)_allNames.count)];
//    name.textAlignment = UITextAlignmentCenter;
//    name.backgroundColor = [UIColor clearColor];
//    name.tag = kNameTag;
//    [rowView addSubview:name];
//    // 3.添加头像 创建子控件 添加到父控件行中
//    UIButton *icon = [UIButton buttonWithType:UIButtonTypeCustom];
//    icon.frame = CGRectMake(20, 0, 50, kRowH);
//    //创建随机头像
////    int randomIndex = arc4random() % 9;//取0-8随机整数（老写法）
//    int randomIndex = arc4random_uniform(9);//取0-8随机整数
//    NSString *imgNames = [NSString stringWithFormat:@"0%d.jpg",randomIndex];
//    UIImage *img = [UIImage imageNamed:imgNames];
//    // 给按钮添加监听器
//    [icon addTarget:self action:@selector(iconClick:) forControlEvents:UIControlEventTouchUpInside];
//    //保持头像宽高不变形
//    [icon setImage:img forState:UIControlStateNormal];
//    [rowView addSubview:icon];
//    // 删除按钮
//    UIButton *delete = [UIButton buttonWithType:UIButtonTypeRoundedRect];
//    delete.frame = CGRectMake(320, 0, 60, 60);
//    [delete setTitle:@"删除" forState:UIControlStateNormal];
//    [delete addTarget:self action:@selector(delClick:) forControlEvents:UIControlEventTouchUpInside];
//    [rowView addSubview:delete];
//    return rowView;
//}
#pragma mark 用xib创建一行并添加文字和头像
//- (UIView *)createRowView
//{
//    // 0.加载RowView文件，创建Objects数组按顺序包装所有控件到数组中返回 xib = nib app打包时候自动生成xib文件
//   NSArray *views = [[NSBundle mainBundle] loadNibNamed:@"RowView" owner:self options:nil];
//    // 1.取出一行view
//    UIView *rowViews = views[0];
//    // 2.设置头像
//    UIButton *imgBtn = (UIButton *)[rowViews viewWithTag:1];
//    NSString *names = [NSString stringWithFormat:@"0%d.jpg",arc4random_uniform(9)];
//    // 2.1设置头像按钮背景图 随机获取头像
//    [imgBtn setImage:[UIImage imageNamed:names] forState:UIControlStateNormal];
//    // 2.2添加头像点击监听
//    [imgBtn addTarget:self action:@selector(iconClick:) forControlEvents:UIControlEventTouchUpInside];
//    // 3.设置描述
//    UILabel *lab = (UILabel *)[rowViews viewWithTag:2];
//    // 3.1随机获取描述信息
//    lab.text =_allNames[arc4random_uniform((int)_allNames.count)];
////    // 4.设置删除按钮
////    UIButton *delBtn = (UIButton *)[rowViews viewWithTag:3];
////    // 4.1添加删除点击监听
////    [delBtn addTarget:self action:@selector(delClick:) forControlEvents:UIControlEventTouchUpInside];
//    return rowViews;
//}
#pragma mark 用自定义xib创建一行view并添加文字和头像
- (UIView *)createRowView
{
    NSString *iconNames = [NSString stringWithFormat:@"0%d.jpg",arc4random_uniform(9)];
    NSString *name = _allNames[arc4random_uniform((int)_allNames.count)];
    RowView *rowView = [RowView rowViewWithIcon:iconNames  name:name];
    return rowView;
}
#pragma mark 监听删除按钮点击
- (void)delClick :(UIButton *)btn
{
    [UIView animateWithDuration:kDuation animations:^{
        // 移动待删除行整体移动到右方
        CGRect  tempF = btn.superview.frame;
        tempF.origin.x = 375;
        btn.superview.frame = tempF;
        btn.superview.alpha = 0;
    } completion:^(BOOL finished) {
        // 1.获得即将删除这行 仔数组中的位置
        int startIndex = (int)[self.view.subviews indexOfObject:btn.superview];
        // 3.删除当前行
        [btn.superview removeFromSuperview];
        [UIView animateWithDuration:kDuation animations:^{
        // 2.遍历子控件 自动上移删除行下方子控件
        for (int i = startIndex; i < self.view.subviews.count; i++) {
            UIView *child = self.view.subviews[i];
            CGRect tempF = child.frame;
            tempF.origin.y -= kRowH + 1;// 添加时候是每行+1
            child.frame = tempF;
        }
        }];
        // 4.判断垃圾桶
        _removes.enabled = self.view.subviews.count > 1;
    }];
}
#pragma mark 监听头像点击
- (void)iconClick :(UIButton *)btn
{
    // 1.取得按钮的父控件（因为lable和btn在同一父控件）
    // 获得按钮点击行的文本标签
    UILabel *label = (UILabel *)[btn.superview viewWithTag:2];
//    NSLog(@"iconClick%f",btn.superview.frame.origin.y);
    NSLog(@"%@",label.text);
}

#pragma mark 删除一行
- (IBAction)remove:(UIBarButtonItem *)sender {
    UIView *lastView = [self.view.subviews lastObject];
    [UIView animateWithDuration:kDuation animations:^{
        CGRect tempF = lastView.frame;
        tempF.origin.x = 375;
        lastView.frame = tempF;
        lastView.alpha = 1;
    } completion:^(BOOL finished) {//动画执行完毕后自动调用这个代码段
             [lastView removeFromSuperview];
        // 剩下子控件个数大于1才能点击删除 c语言写法
        _removes.enabled = self.view.subviews.count > 1;
    }];
}
@end

一运行报错

 unrecognized selector sent to instance 0x7f9d3b56f5c0 UIImage setImage：forstate?
仔细检查这个icon头像按钮发现修改了它默认的Class。重新清空值（默认为UIButton）后运行成功