这次的学习的内容是关于在button动态方法连接多个switch 和textfield
目标：这次的学习的内容是关于在button动态方法连接多个switch 和textfield, switch判定textfield的显示结果, 使用代码获取button动态方法，并且在interfaceBuilder内对button，switch和textfield进行动态交互连接，然后显示运行结果。
编码：

//

// ViewController.h

// hhhh

//

// Created by bitcar on 12-7-10.

// Copyright (c) 2012年 bitcar . All rights reserved.

//

#import <UIKit/UIKit.h>

#import <Foundation/Foundation.h>

@interface ViewController : UIViewController

{

IBOutlet UITextField *passwordlength;

IBOutlet UITextField *password;

IBOutlet UISwitch *includeUpperCase;

IBOutlet UISwitch *includeLowerCase;

IBOutlet UISwitch *includeNumbers;

}

@property (nonatomic, retain) UITextField *passwordlength;

@property (nonatomic, retain) UITextField *password;

@property (nonatomic, retain) UISwitch *includeUpperCase;

@property (nonatomic, retain) UISwitch *includeLowerCase;

@property (nonatomic, retain) UISwitch *includeNumbers;

//-(IBAction)setPassword:(id)sender;

- (IBAction)onPasswordButtonClick:(id)sender;

@end

#import "ViewController.h"

@implementation ViewController

@synthesize passwordlength, password;

@synthesize includeLowerCase, includeNumbers, includeUpperCase;

#define RANDOM_SEED() srandom(time(NULL))

//定义随机值，用最小值和最大值和随机数来计算，返回整数值

#define RANDOM_INT(_MIN_, _MAX_) ((_MIN_) +random() % ((_MAX_ +1) - (_MIN_)))

//控件输入返回判定方法

- (BOOL) textFieldShouldReturn: (UITextField*)textField

{

if(textField == password)

{

[password resignFirstResponder];//隐藏密码文本框输入的键盘

}

if(textField == passwordlength)

{

[passwordlength resignFirstResponder];//隐藏密码长度文本框输入的键盘

}

return YES;

}

//button方法，点击的密码显示在文本框里

//-(IBAction)setPassword:(id)sender

- (IBAction)onPasswordButtonClick:(id)sender

{

//输入密码长度

NSInteger iPasswordLength = [passwordlength.text intValue];

//打开字母小写

BOOL bIncludeLowerCase = includeLowerCase.on;

//打开字母大写

BOOL bIncludeUpperCase = includeUpperCase.on;

//打开数字

BOOL bIncludeNumbers = includeNumbers.on;

NSString *passwordText = @"";

//定义a到z字母

NSString *lowercaseChars = @"abcdefghijklmnopqrstuvwxyz";

//定义A到Z字母

NSString *uppercaseChars = @"ABCDEFGHIGKLMNOPQRSTUVWXYZ";

//定义数字

NSString *numbersChars = @"1234567890";

//随机变量

RANDOM_SEED();

//字符对象为空

NSString *passwordChars = @"";

//字母小写的条件语句

if(bIncludeLowerCase)

{

passwordChars =

[NSString stringWithFormat:@"%@%@", passwordChars, lowercaseChars];

}

//字母大写的条件语句

if (bIncludeUpperCase) {

passwordChars =

[NSString stringWithFormat:@"%@%@", passwordChars, uppercaseChars];

}

//字母为数字的条件语句

if (bIncludeNumbers) {

passwordChars =

[NSString stringWithFormat:@"%@%@", passwordChars, numbersChars];

}

//数值从0开始，当数值小于密码长度，取得数字字符，获取的数据转换为文字格式

for (NSInteger i=0; i<iPasswordLength; i++)

{

int index = RANDOM_INT(0, [passwordChars length]-1);

NSRange range = NSMakeRange(index,1);

NSString *passwordChar = [passwordChars substringWithRange:range];

passwordText =

[NSString stringWithFormat:@"%@%@", passwordText, passwordChar];

}

password.text = @"";

password.text = passwordText;

}

- (void)viewDidLoad

{

[super viewDidLoad];

// Do any additional setup after loading the view, typically from a nib.

}

- (void)didReceiveMemoryWarning

{

[super didReceiveMemoryWarning];

// Dispose of any resources that can be recreated.

}

- (void) dealloc

{

[passwordlength release];

[password release];

[includeNumbers release];

[includeLowerCase release];

[includeUpperCase release];

[super dealloc];

}

@end

运行程序：
当把所有字母大写小写和数字开启时。

当只把字母大写关闭时。

当把数字开启时。
总结：@property (nonatomic, retain) UITextField *password;

//-(IBAction)setPassword:(id)sender;

这次的编码因为系统误认set,get的原因让程序不能执行，我将记录下并分析其中的原因。

当把“按扭生成密码“这个方法写成setPassword时，系统出现如下的警告：

原因是运行时程序将这个方法误认为set get。导致程序不能执行。

如果把它改成- (IBAction)onPasswordButtonClick:(id)sender;便没问题了。

代码学习：写一个set 为string:
-(void) setPassword: (NSString){ [password release]; password = nill; self.password = _password;}不返回值-(NSString) getPassword{return password;}