某自称菜鸟的日常笔记(3)

iOS main函数 机器码 ，不懂汇编，哪里写错了，麻烦指出来
0x2730: pushl 0（将出错码入栈）0x2730:pushl0 （ 将出错码入栈）
当异常发生时，如果控制单元没有自动地把一个硬件错误代码插入到栈中，相应的汇编语言片段会包含一条pushl $0指令，在栈中垫上一个空值,如果错误码已经被压入堆栈,则没有这条指令。然后，把异常处理函数的地址压进栈中；函数的名字由异常处理程序名与do_前缀组成

0x2732: movl %esp, %ebp
栈指址（低地址）%esp栈顶值赋给栈基址（高地址）%ebp栈底，设置 main函数的栈基址

0x2734: andl −16,它等价于andl0xfffffff0,%esp,也就是说把%esp内的最后4位给抹掉，强制让%esp的值是16的倍数，GCC默认的堆栈是16字节对齐的，为了加快CPU的访问效率

0x2737: subl $16, %esp
%esp栈顶向下移动16个字节，给临时变量留出来

0x273a: movl 4(%ebp), %ebx
保存旧的栈基址,4(%ebp)等于 : (%ebp +4) ,%ebp + 4
是表示一个地址值，加上括号表示存储在该地址上的内容

0x273d: movl %ebx, (%esp)
复制对齐的指针 ,把%ebx的值写到栈顶，但不会使栈指针值发生变化

0x2740: leal 8(%ebp), %ecx
局部变量的地址直到程序运行才能被识别,必须用leal指令寻址。但leal的效率相对movl xxx要低得多 ,传送%ebp+8的地址写到%ecx寄存器

0x2743: movl %ecx, 4(%esp)
把%ecx的值写到%esp+4

0x2747: addl $1, %ebx
%ebx＋1

0x274a: shll $2, %ebx
%ebx 左移2位

0x274d: addl %ecx, %ebx
%ebx＋ %ecx

0x274f: movl %ebx, 8(%esp)
把%ebx值写到％esp＋8

0x2753: movl (%ebx), %eax
把%ebx值写到%eax寄存器

0x2755: addl $4, %ebx
%ebx＋4

0x2758: testl %eax, %eax
testl的执行会影响状态寄存器。%eax & %eax
如果al不为0,则testb %eax , %eax，标志位NZ为1

0x275a: jne 0x2753 ; start + 35
jne不等于时转移

0x275c: movl %ebx, 12(%esp)
把％ebx值写到%esp＋12

0x2760: calll 0x27b0 ; main at main.m:14
calll 将当前的IP压栈后，转到标号处执行指令
调用0x27b0标示的程序

0x2765: movl %eax, (%esp)
把％eax值写到%esp

0x2768: calll 0xb2db6 ; symbol stub for: exit
调用0xb2db6标示的程序

0x276d: hlt
cpu暂停，等到有复位信号或中断信号输入再运行

0x276e: nop
空指令，就是让cpu等待一个周期，可能等待外设输入
0x276f: nop
//–
分析开发者指南源码 GIT地址 https://github.com/iimgal/StudyiOS
ContactViewController.h 头文件

复制代码

import

import

import

import “ContactViewController.h”

@implementation ContactViewController
//合成器
@synthesize label;
/**
手动初始化ViewController nibNameOrNil 直需要文件名，无需扩展即contact(.nib不需要)
**/
- (id)initWithNibName:(NSString )nibNameOrNil bundle:(NSBundle )nibBundleOrNil
{
self = [super initWithNibName:nibNameOrNil bundle:nibBundleOrNil];
//初始化父类ViewController
if (self) {
// Custom initialization
}
return self; //跳出
}
/**
当内存不足时，释放不需要的内存，缓存，未显示的view等
**/
- (void)didReceiveMemoryWarning
{
// Releases the view if it doesn’t have a superview.
[super didReceiveMemoryWarning];

// Release any cached data, images, etc that aren't in use.

}
#pragma mark - View lifecycle
/*
// Implement loadView to create a view hierarchy programmatically, without using a nib.
- (void)loadView
{
}
*/
// Implement viewDidLoad to do additional setup after loading the view, typically from a nib.
/**
视图加载时调用
**/
- (void)viewDidLoad
{
// 增加Code按钮，可跳转至教学页面
//初始化一个新的按钮，使用指定的标题，样式，目标（自己还是其他view视图），出口方法。
UIBarButtonItem *item = [[UIBarButtonItem alloc] initWithTitle:@”Code” style:UIBarButtonItemStyleBordered target:self action:@selector(code)];
//设置按钮到右侧
self.navigationItem.rightBarButtonItem = item;
//初始化
[super viewDidLoad];
}
/**
当内存不足时，最大程度释放内存
**/
- (void)viewDidUnload
{
self.label = nil; //重置lable
[super viewDidUnload]; //释放内存
// Release any retained subviews of the main view.
// e.g. self.myOutlet = nil;
}
/**
是否支持iphone 旋转
**/
- (BOOL)shouldAutorotateToInterfaceOrientation:(UIInterfaceOrientation)interfaceOrientation
{
// Return YES for supported orientations
//系统默认不支持旋转功能
return (interfaceOrientation == UIInterfaceOrientationPortrait);
}
重点内容#pragma mark -
#pragma mark Show all contacts
// Called when users tap “Display Picker” in the application. Displays a list of contacts and allows users to select a contact from that list.
// The application only shows the phone, email, and birthdate information of the selected contact.
/**
查看联系人数据
1、先初始化系统通讯控件
2、设置需要显示的信息，手机等
3、用presentModalViewController 呈现
**/
-(void)showPeoplePickerController
{
// 查看联系人 系统的通讯录控件
ABPeoplePickerNavigationController *picker = [[ABPeoplePickerNavigationController alloc] init];
picker.peoplePickerDelegate = self; //委托给自己
// Display only a person’s phone, email, and birthdate

/**消息设置版[picker setDisplayedProperties:[NSArray arrayWithObjects:[NSNumber numberWithInt:kABPersonPhoneProperty],                                [NSNumber numberWithInt:kABPersonEmailProperty],                                [NSNumber numberWithInt:kABPersonBirthdayProperty], nil]];//属性版 picker.displayedProperties = NSArray arrayWithObjects:[NSNumber numberWithInt:kABPersonPhoneProperty], [NSNumber numberWithInt:kABPersonEmailProperty], [NSNumber numberWithInt:kABPersonBirthdayProperty], nil];*/ //将手机，邮箱，生日数据压入数组NSArray *displayedItems = [NSArray arrayWithObjects:[NSNumber numberWithInt:kABPersonPhoneProperty],                           [NSNumber numberWithInt:kABPersonEmailProperty],                           [NSNumber numberWithInt:kABPersonBirthdayProperty], nil];//设置需要显示的数据picker.displayedProperties = displayedItems;// Show the picker//显示数据 使用 presentModalViewController可创建新视图，可用于视图之间的切换[self presentModalViewController:picker animated:YES];

}
#pragma mark Display and edit a person
// Called when users tap “Display and Edit Contact” in the application. Searches for a contact named “Appleseed” in
// in the address book. Displays and allows editing of all information associated with that contact if
// the search is successful. Shows an alert, otherwise.
/**
编辑地址薄数据
1、ABAddressBookCreate 得到地址薄
2、查找是否有张三数据
3、如果没有提示用户，有则进入编辑视图
**/
-(void)showPersonViewController
{
// 得到地址薄 iphone6.0不推荐使用
ABAddressBookRef addressBook = ABAddressBookCreate();
// 寻找名为“CC”的联系人
NSArray people = (__bridge NSArray )ABAddressBookCopyPeopleWithName(addressBook, CFSTR(“zhangsan”));
// Display “Appleseed” information if found in the address book
//如果有数据
if ((people != nil) && [people count])
{
//ABRecordRef 一个指向Core Foundation对象的通用指针
ABRecordRef person = (__bridge ABRecordRef)[people objectAtIndex:0];
ABPersonViewController *picker = [[ABPersonViewController alloc] init]; //初始化
picker.personViewDelegate = self;
picker.displayedPerson = person;
//精简版 picker.displayedPerson ＝ (__bridge ABRecordRef)[people objectAtIndex:0]；
// Allow users to edit the person’s information
picker.allowsEditing = YES;
//更新联系人数据到编辑视图
[self.navigationController pushViewController:picker animated:YES];
}
else //没有数据则给一些提示信息
{
// Show an alert if “Appleseed” is not in Contacts
//UIAlertView常用于应用界面信息警告提示
UIAlertView *alert = [[UIAlertView alloc] initWithTitle:@”Error”
message:@”Could not find 张三 in the Contacts application”
delegate:nil
cancelButtonTitle:@”Cancel”
otherButtonTitles:nil];
[alert show]; //弹出提示
}

CFRelease(addressBook); //释放

}
#pragma mark Create a new person
// Called when users tap “Create New Contact” in the application. Allows users to create a new contact.
/**
创建新的联系人
1、初始化系统的新增联系人控件
2、新建一个导航控制器
3、创建新视图
**/
-(void)showNewPersonViewController
{
// 初始化系统的新增联系人控件
ABNewPersonViewController *picker = [[ABNewPersonViewController alloc] init];
picker.newPersonViewDelegate = self;

//新建一个导航控制器UINavigationController *navigation = [[UINavigationController alloc] initWithRootViewController:picker];//创建新视图，可用于视图之间的切换[self presentModalViewController:navigation animated:YES];

}

pragma mark Add data to an existing person

// Called when users tap “Edit Unknown Contact” in the application.
/**
当点击未知联系人
**/
-(void)showUnknownPersonViewController
{
// 打开联系人数据库 iphone6.0不推荐使用
ABRecordRef aContact = ABPersonCreate();
CFErrorRef anError = NULL;

//返回一个新的，空的，可变的多值属性ABMultiValueRef email = ABMultiValueCreateMutable(kABMultiStringPropertyType);//添加到多值属性的值及其对应的标签。bool didAdd = ABMultiValueAddValueAndLabel(email, @"[e-mail]", kABOtherLabel, NULL);if (didAdd == YES) //添加成功{    //添加单个项的属性值，如邮箱. int32_t ABPropertyID    ABRecordSetValue(aContact, kABPersonEmailProperty, email, &anError);    if (anError == NULL)    {       //设置联系人数据        ABUnknownPersonViewController *picker = [[ABUnknownPersonViewController alloc] init];        picker.unknownPersonViewDelegate = self;        picker.displayedPerson = aContact;        picker.allowsAddingToAddressBook = YES;        picker.allowsActions = YES;        picker.alternateName = @"John Appleseed";        picker.title = @"John Appleseed";        picker.message = @"Company, Inc";        //创建新视图        [self.navigationController pushViewController:picker animated:YES];    }    else  //添加失败，给提示信息    {        UIAlertView *alert = [[UIAlertView alloc] initWithTitle:@"Error"                                                        message:@"Could not create unknown user"                                                       delegate:nil                                              cancelButtonTitle:@"Cancel"                                              otherButtonTitles:nil];        [alert show];    }}    CFRelease(email);//释放CFRelease(aContact);//释放

}
#pragma mark ABPeoplePickerNavigationControllerDelegate methods
// Displays the information of a selected person
- (BOOL)peoplePickerNavigationController:(ABPeoplePickerNavigationController *)peoplePicker
shouldContinueAfterSelectingPerson:(ABRecordRef)person
{
self.label.text = [IIAddressBook getFullName:person];
//[self dismissModalViewControllerAnimated:YES];
//return NO;
return YES;
}
// Does not allow users to perform default actions such as dialing a phone number, when they select a person property.
- (BOOL)peoplePickerNavigationController:(ABPeoplePickerNavigationController *)peoplePicker shouldContinueAfterSelectingPerson:(ABRecordRef)person
property:(ABPropertyID)property identifier:(ABMultiValueIdentifier)identifier
{
return NO;
}
// Dismisses the people picker and shows the application when users tap Cancel.
- (void)peoplePickerNavigationControllerDidCancel:(ABPeoplePickerNavigationController *)peoplePicker;
{
[self dismissModalViewControllerAnimated:YES];
}
#pragma mark ABPersonViewControllerDelegate methods
// Does not allow users to perform default actions such as dialing a phone number, when they select a contact property.
- (BOOL)personViewController:(ABPersonViewController *)personViewController shouldPerformDefaultActionForPerson:(ABRecordRef)person
property:(ABPropertyID)property identifier:(ABMultiValueIdentifier)identifierForValue
{
return NO;
}
#pragma mark ABNewPersonViewControllerDelegate methods
// Dismisses the new-person view controller.
- (void)newPersonViewController:(ABNewPersonViewController *)newPersonViewController didCompleteWithNewPerson:(ABRecordRef)person
{
[self dismissModalViewControllerAnimated:YES];
}
#pragma mark ABUnknownPersonViewControllerDelegate methods
// Dismisses the picker when users are done creating a contact or adding the displayed person properties to an existing contact.
- (void)unknownPersonViewController:(ABUnknownPersonViewController *)unknownPersonView didResolveToPerson:(ABRecordRef)person
{
[self dismissModalViewControllerAnimated:YES];
}
// Does not allow users to perform default actions such as emailing a contact, when they select a contact property.
- (BOOL)unknownPersonViewController:(ABUnknownPersonViewController *)personViewController shouldPerformDefaultActionForPerson:(ABRecordRef)person
property:(ABPropertyID)property identifier:(ABMultiValueIdentifier)identifier
{
return NO;
}
// 跳转至教学页面
- (void)code
{
//初始化code一些提示数据 视图
CodeViewController *controller = [[CodeViewController alloc] initWithNibName:@”CodeViewController” bundle:nil];
NSString *name = [NSString stringWithUTF8String:object_getClassName(self)];
controller.className = name;
//精简版 controller.className ＝ [NSString stringWithUTF8String:object_getClassName(self)]；

[self.navigationController pushViewController:controller animated:YES];

}
@end

//–
知识重点：
1
AddressBookUI中提供了和联系人显示信息相关的一些Controller，有四个：
ABPeoplePickerNavigationController：显示整个通讯录并可以选择一个联系人的信息
ABPersonViewController：显示一个具体联系人的信息
ABNewPersonViewController：增加一个新的联系人
ABUnknownPersonViewController：完善一个联系人的信息

2
viewDidLoad其实没什么可混淆的,无论通过什么途径加载(Xcode或者IB,这里的加载属于实例化)完view后肯定会执行这个方法.

loadView需要分两种情况.当你通过Xcode实例化一个类的时候就需要自己在controller中实现这个方法.而在IB中实例化就不需要实现它.

initWithNibName这个方法是在controller的类在IB中创建,但是通过Xcode实例化controller的时候用的.

awakeFromNib是类在IB中被实例化调用.推荐使用viewDidLoad,因为viewDidLoad会被多次调用,而awakeFromNib只会当从nib文件中unarchive的时候才会被调用一次，awakeFromNib被调用时，viewDidLoad不会被调用

当.nib文件被加载的时候，会发送一个awakeFromNib的消息到.nib文件中的每个对象，每个对象都可以定义自己的awakeFromNib函数来响应这个消息，也就是说通过nib文件创建view对象来执行awakeFromNib

当view对象被加载到内存是就会执行viewDidLoad，所以不管通过nib文件还是代码的方式创建对象都会执行viewDidLoad

3.
UIBarButtonItem 工具栏按钮有3种主要的定制方法：1、在Interface builder中定制；2、setItems方法定制；3、addSubview方法定制。

UIBarButtonItem * clearnButton = [UIBarButtonItem alloc] initWithTitle:@”Code” style:UIBarButtonItemStyleBordered target:self action:@selector(code)]; 初始化

NSArray *buttonArray = [[NSArray alloc]initWithObjects:cleanButton,saveButton, nil];
self.navigationItem.rightBarButtonItems = buttonArray; 多按钮用法

4、
[super class] 先转换成 objc_msgSendSuper 的方法。构造 objc_super 的结构体
id objc_msgSendSuper(struct objc_super *super, SEL op, …)
struct objc_super {
id receiver;
Class superClass;
};

shouldAutorotateToInterfaceOrientation 自动旋转功能

5、
ABPeoplePickerNavigationController 系统的通讯录控件
ABPeoplePickerNavigationController *picker = [[ABPeoplePickerNavigationController alloc] init];
picker.peoplePickerDelegate = self; //初始化

6、
__bridge只做类型转换，但是不修改对象（内存）管理权；
__bridge_transfer（也可以使用CFBridgingRelease）将Core Foundation的对象转换为Objective-C的对象，同时将对象（内存）的管理权交给ARC。

7、
__bridge_retained（也可以使用CFBridgingRetain）将Objective-C的对象转换为Core Foundation的对象，同时将对象（内存）的管理权交给我们，后续需要使用CFRelease或者相关方法来释放对象

8、
UIAlertView常用于应用界面信息警告提示

9、
ABRecordRef 一个指向Core Foundation对象的通用指针

ABRecordRef是某一条通讯录记录

ABMultiValueRef是通讯录中某一个可能有多个字段数值的记录
ABAddressBookRef 就是某个通讯录
ABRecordID是记录的id, int类型

10、
ABMultiValueCreateMutable 返回一个新的，空的，可变的多值属性
ABMultiValueAddValueAndLabel 添加到多值属性的值及其对应的标签
ABRecordSetValue(aContact, kABPersonEmailProperty, email, &anError); 添加单个项的属性值