iPhone3开发基础教程中一部分有用代码片段(1)

iPhone3开发基础教程中部分有用代码片段(1)

《beginning iphone3 development exploring the iphone SDK》一书中有很多基础的代码片段，由这些最原始的代码片段组成了我们的复杂的iphone应用程序，所以这里就借用一网友的总结，一大家一起分享。

1. stringWithFormat 用法：

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[NSString stringWithFormat:@"Hight: %d°%@ Low: %d°%@", [Temp],@"C",[lTemp],@"C"];
[NSString stringWithFormat:@"Hight: %d°%@ Low: %d°%@", [Temp],@"C",[lTemp],@"C"];

2. NSDate 用法：

NSDate *today;

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NSDate *tomorrow;
today = [NSDate date];
tomorrow = [NSDate dateWithTimeInterval:(i*24*60*60) sinceDate:today]; //可能有更好的
NSDate *tomorrow;
    today = [NSDate date];
    tomorrow = [NSDate dateWithTimeInterval:(i*24*60*60) sinceDate:today]; //可能有更好的

Date format用法：

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-(NSString *) getDay:(NSDate *) d {
   NSString *s ;
   NSDateFormatter *format = [[NSDateFormatter alloc] init];
   [format setDateFormat:@"YYYY/MM/dd hh:mm:ss"];
   s = [format stringFromDate:d];
   [format release];
   return s;
-(NSString *) getDay:(NSDate *) d {
    NSString *s ;
    NSDateFormatter *format = [[NSDateFormatter alloc] init];
    [format setDateFormat:@"YYYY/MM/dd hh:mm:ss"];
    s = [format stringFromDate:d];
    [format release];
    return s;
}

各地时区获取：

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NSDate *nowDate = [NSDate new];
   NSDateFormatter *formatter    = [[NSDateFormatter alloc] init];
   [formatter    setDateFormat:@"yyyy/MM/dd HH:mm:ss"];
   //    根据时区名字获取当前时间，如果该时区不存在，默认获取系统当前时区的时间
   //    NSTimeZone* timeZone = [NSTimeZone timeZoneWithName:@"Europe/Andorra"];
   //    [formatter setTimeZone:timeZone];
   //获取所有的时区名字
   NSArray *array = [NSTimeZone knownTimeZoneNames];
   //    NSLog(@"array:%@",array);
   //for循环
   //    for(int i=0;i<[array count];i++)
   //    {
   //        NSTimeZone* timeZone = [NSTimeZone timeZoneWithName:[array objectAtIndex:i]];
   //        [formatter setTimeZone:timeZone];
   //        NSString *locationTime = [formatter stringFromDate:nowDate];
   //        NSLog(@"时区名字:%@   : 时区当前时间: %@",[array objectAtIndex:i],locationTime);
   //        //NSLog(@"timezone name is:%@",[array objectAtIndex:i]);
   //    }
   //快速枚举法
   for(NSString *timeZoneName in array){
       [formatter setTimeZone:[NSTimeZone timeZoneWithName:timeZoneName]];
       NSLog(@"%@,%@",timeZoneName,[formatter stringFromDate:nowDate]);
   }

   [formatter release];
   [nowDate release];
NSDate *nowDate = [NSDate new];
    NSDateFormatter *formatter    = [[NSDateFormatter alloc] init];
    [formatter    setDateFormat:@"yyyy/MM/dd HH:mm:ss"];
    //    根据时区名字获取当前时间，如果该时区不存在，默认获取系统当前时区的时间
    //    NSTimeZone* timeZone = [NSTimeZone timeZoneWithName:@"Europe/Andorra"];
    //    [formatter setTimeZone:timeZone];
    //获取所有的时区名字
    NSArray *array = [NSTimeZone knownTimeZoneNames];
    //    NSLog(@"array:%@",array);
    //for循环
    //    for(int i=0;i<[array count];i++)
    //    {
    //        NSTimeZone* timeZone = [NSTimeZone timeZoneWithName:[array objectAtIndex:i]];
    //        [formatter setTimeZone:timeZone];
    //        NSString *locationTime = [formatter stringFromDate:nowDate];
    //        NSLog(@"时区名字:%@   : 时区当前时间: %@",[array objectAtIndex:i],locationTime);
    //        //NSLog(@"timezone name is:%@",[array objectAtIndex:i]);
    //    }
    //快速枚举法
    for(NSString *timeZoneName in array){
        [formatter setTimeZone:[NSTimeZone timeZoneWithName:timeZoneName]];
        NSLog(@"%@,%@",timeZoneName,[formatter stringFromDate:nowDate]);
    }

    [formatter release];
    [nowDate release];

3. NSCalendar用法：

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-(NSString *) getWeek:(NSDate *) d {

    NSCalendar *calendar = [[NSCalendar alloc] initWithCalendarIdentifier:NSGregorianCalendar];
    unsigned units = NSYearCalendarUnit | NSMonthCalendarUnit | NSDayCalendarUnit | NSWeekdayCalendarUnit;
    NSDateComponents *components = [calendar components:units fromDate:d];
    [calendar release];

    switch ([components weekday]) {
        case 2:
            return @"Monday";
            break;
        case 3:
            return @"Tuesday";
            break;
        case 4:
            return @"Wednesday";
            break;
        case 5:
           return @"Thursday";
            break;
        case 6:
            return @"Friday";
            break;
        case 7:
            return @"Saturday";
            break;
        case 1:
            return @"Sunday";
            break;
        default:
            return @"No Week";
            break;
    }
    // 用components，我们可以读取其他更多的数据。

}
-(NSString *) getWeek:(NSDate *) d {

    NSCalendar *calendar = [[NSCalendar alloc] initWithCalendarIdentifier:NSGregorianCalendar];
    unsigned units = NSYearCalendarUnit | NSMonthCalendarUnit | NSDayCalendarUnit | NSWeekdayCalendarUnit;
    NSDateComponents *components = [calendar components:units fromDate:d];
    [calendar release];

    switch ([components weekday]) {
        case 2:
            return @"Monday";
            break;
        case 3:
            return @"Tuesday";
            break;
        case 4:
            return @"Wednesday";
            break;
        case 5:
           return @"Thursday";
            break;
        case 6:
            return @"Friday";
            break;
        case 7:
            return @"Saturday";
            break;
        case 1:
            return @"Sunday";
            break;
        default:
            return @"No Week";
            break;
    }
    // 用components，我们可以读取其他更多的数据。

}

4. 用Get方式读取网络数据：

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// 将网络数读取为字符串
- (NSString *) getDataByURL:(NSString *) url {
    return [[NSString alloc] initWithData:[NSData dataWithContentsOfURL:[NSURL URLWithString:[url stringByAddingPercentEscapesUsingEncoding:NSUTF8StringEncoding]]] encoding:NSUTF8StringEncoding];
}
//读取网络图片
- (UIImage *) getImageByURL:(NSString *) url {
    return [[UIImage alloc] initWithData:[NSData dataWithContentsOfURL:[NSURL URLWithString:[url stringByAddingPercentEscapesUsingEncoding:NSUTF8StringEncoding]]]];
}
// 将网络数读取为字符串
- (NSString *) getDataByURL:(NSString *) url {
    return [[NSString alloc] initWithData:[NSData dataWithContentsOfURL:[NSURL URLWithString:[url stringByAddingPercentEscapesUsingEncoding:NSUTF8StringEncoding]]] encoding:NSUTF8StringEncoding];
}
//读取网络图片
- (UIImage *) getImageByURL:(NSString *) url {
    return [[UIImage alloc] initWithData:[NSData dataWithContentsOfURL:[NSURL URLWithString:[url stringByAddingPercentEscapesUsingEncoding:NSUTF8StringEncoding]]]];
}

5. 多线程NSThread用法：

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[NSThread detachNewThreadSelector:@selector(scheduleTask) toTarget:self withObject:nil];
-(void) scheduleTask {
    //create a pool
    NSAutoreleasePool *pool = [[NSAutoreleasePool alloc] init];
    //release the pool;
    [pool release];
}
//如果有参数，则这么使用：
[NSThread detachNewThreadSelector:@selector(scheduleTask:) toTarget:self withObject:[NSDate date]];
-(void) scheduleTask:(NSDate *) mdate {
    //create a pool
    NSAutoreleasePool *pool = [[NSAutoreleasePool alloc] init];
    //release the pool;
    [pool release];
}
//注意selector里有冒号。
    //在线程里运行主线程里的方法
   UIApplication* app = [UIApplication sharedApplication];
    [app performSelectorOnMainThread:@selector(moveToMain) withObject:nil waitUntilDone:FALSE];
[NSThread detachNewThreadSelector:@selector(scheduleTask) toTarget:self withObject:nil];
-(void) scheduleTask {
    //create a pool
    NSAutoreleasePool *pool = [[NSAutoreleasePool alloc] init];
    //release the pool;
    [pool release];
}
//如果有参数，则这么使用：
[NSThread detachNewThreadSelector:@selector(scheduleTask:) toTarget:self withObject:[NSDate date]];
-(void) scheduleTask:(NSDate *) mdate {
    //create a pool
    NSAutoreleasePool *pool = [[NSAutoreleasePool alloc] init];
    //release the pool;
    [pool release];
}
//注意selector里有冒号。
    //在线程里运行主线程里的方法
   UIApplication* app = [UIApplication sharedApplication];
    [app performSelectorOnMainThread:@selector(moveToMain) withObject:nil waitUntilDone:FALSE];

6. 定时器NSTimer用法:

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// 一个可以自动关闭的Alert窗口
    UIAlertView *alert = [[UIAlertView alloc] initWithTitle:nil
                                                    message:[@"一个可以自动关闭的Alert窗口"
                                                   delegate:nil
                                          cancelButtonTitle:nil //NSLocalizedString(@"OK", @"OK")   //取消任何按钮
                                          otherButtonTitles:nil];
    //[alert setBounds:CGRectMake(alert.bounds.origin.x, alert.bounds.origin.y, alert.bounds.size.width, alert.bounds.size.height+30.0)];
    [alert show];

    UIActivityIndicatorView *indicator = [[UIActivityIndicatorView alloc] initWithActivityIndicatorStyle:UIActivityIndicatorViewStyleWhiteLarge];

    // Adjust the indicator so it is up a few pixels from the bottom of the alert
    indicator.center = CGPointMake(alert.bounds.size.width/2, alert.bounds.size.height-40.0);
    [indicator startAnimating];
    [alert insertSubview:indicator atIndex:0];
    [indicator release];

    [NSTimer scheduledTimerWithTimeInterval:3.0f
                                     target:self
                                   selector:@selector(dismissAlert:)
                                   userInfo:[NSDictionary dictionaryWithObjectsAndKeys:alert, @"alert", @"testing ", @"key" ,nil] //如果不用传递参数，那么可以将此项设置为nil.
                                    repeats:NO];
    NSLog(@"release alert");
    [alert release];
-(void) dismissAlert:(NSTimer *)timer{

    NSLog(@"release timer");
    NSLog([[timer userInfo] objectForKey:@"key"]);

    UIAlertView *alert = [[timer userInfo] objectForKey:@"alert"];
    [alert dismissWithClickedButtonIndex:0 animated:YES];

}
// 一个可以自动关闭的Alert窗口
    UIAlertView *alert = [[UIAlertView alloc] initWithTitle:nil
                                                    message:[@"一个可以自动关闭的Alert窗口"
                                                   delegate:nil
                                          cancelButtonTitle:nil //NSLocalizedString(@"OK", @"OK")   //取消任何按钮
                                          otherButtonTitles:nil];
    //[alert setBounds:CGRectMake(alert.bounds.origin.x, alert.bounds.origin.y, alert.bounds.size.width, alert.bounds.size.height+30.0)];
    [alert show];

    UIActivityIndicatorView *indicator = [[UIActivityIndicatorView alloc] initWithActivityIndicatorStyle:UIActivityIndicatorViewStyleWhiteLarge];

    // Adjust the indicator so it is up a few pixels from the bottom of the alert
    indicator.center = CGPointMake(alert.bounds.size.width/2, alert.bounds.size.height-40.0);
    [indicator startAnimating];
    [alert insertSubview:indicator atIndex:0];
    [indicator release];

    [NSTimer scheduledTimerWithTimeInterval:3.0f
                                     target:self
                                   selector:@selector(dismissAlert:)
                                   userInfo:[NSDictionary dictionaryWithObjectsAndKeys:alert, @"alert", @"testing ", @"key" ,nil] //如果不用传递参数，那么可以将此项设置为nil.
                                    repeats:NO];
    NSLog(@"release alert");
    [alert release];
-(void) dismissAlert:(NSTimer *)timer{

    NSLog(@"release timer");
    NSLog([[timer userInfo] objectForKey:@"key"]);

    UIAlertView *alert = [[timer userInfo] objectForKey:@"alert"];
    [alert dismissWithClickedButtonIndex:0 animated:YES];

}

7. 用户缺省值NSUserDefaults读取：

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//得到用户缺省值
    NSUserDefaults *defs = [NSUserDefaults standardUserDefaults];

    //在缺省值中找到AppleLanguages, 返回值是一个数组
    NSArray* languages = [defs objectForKey:@"AppleLanguages"];
    NSLog(@"all language语言 is %@", languages);

    //在得到的数组中的第一个项就是用户的首选语言了
    NSLog(@"首选语言 is %@",[languages objectAtIndex:0]);
    //get the language & country code
    NSLocale *currentLocale = [NSLocale currentLocale];

    NSLog(@"Language Code is %@", [currentLocale objectForKey:NSLocaleLanguageCode]);
    NSLog(@"Country Code is %@", [currentLocale objectForKey:NSLocaleCountryCode]);
//得到用户缺省值
    NSUserDefaults *defs = [NSUserDefaults standardUserDefaults];

    //在缺省值中找到AppleLanguages, 返回值是一个数组
    NSArray* languages = [defs objectForKey:@"AppleLanguages"];
    NSLog(@"all language语言 is %@", languages);

    //在得到的数组中的第一个项就是用户的首选语言了
    NSLog(@"首选语言 is %@",[languages objectAtIndex:0]);
    //get the language & country code
    NSLocale *currentLocale = [NSLocale currentLocale];

    NSLog(@"Language Code is %@", [currentLocale objectForKey:NSLocaleLanguageCode]);
    NSLog(@"Country Code is %@", [currentLocale objectForKey:NSLocaleCountryCode]);

8. View之间切换的动态效果设置：

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SettingsController *settings = [[SettingsController alloc]initWithNibName:@"SettingsView" bundle:nil];
settings.modalTransitionStyle = UIModalTransitionStyleFlipHorizontal; //水平翻转
[self presentModalViewController:settings animated:YES];
[settings release];
    SettingsController *settings = [[SettingsController alloc]initWithNibName:@"SettingsView" bundle:nil];
    settings.modalTransitionStyle = UIModalTransitionStyleFlipHorizontal; //水平翻转
    [self presentModalViewController:settings animated:YES];
    [settings release];

9.NSScrollView 滑动用法：

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-(void) scrollViewDidScroll:(UIScrollView *)scrollView{
    NSLog(@"正在滑动中...");
}
//用户直接滑动NSScrollView，可以看到滑动条
-(void) scrollViewDidEndDecelerating:(UIScrollView *)scrollView {
}
// 通过其他控件触发NSScrollView滑动，看不到滑动条
- (void) scrollViewDidEndScrollingAnimation:(UIScrollView *)scrollView {
}
-(void) scrollViewDidScroll:(UIScrollView *)scrollView{
    NSLog(@"正在滑动中...");
}
//用户直接滑动NSScrollView，可以看到滑动条
-(void) scrollViewDidEndDecelerating:(UIScrollView *)scrollView {
}
// 通过其他控件触发NSScrollView滑动，看不到滑动条
- (void) scrollViewDidEndScrollingAnimation:(UIScrollView *)scrollView {
}

10. 读取全局的Delegate：

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KiloNetAppDelegate *appdelegate = (KiloNetAppDelegate *)[[UIApplication sharedApplication] delegate];
KiloNetAppDelegate *appdelegate = (KiloNetAppDelegate *)[[UIApplication sharedApplication] delegate];

11.键盘处理系列

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//set the UIKeyboard to switch to a different text field when you press return
//switch textField to the name of your textfield
[textField becomeFirstResponder];
//set the UIKeyboard to switch to a different text field when you press return
//switch textField to the name of your textfield
[textField becomeFirstResponder];

12. 半透明层的实现：

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+(void)showWaiting:(UIView *)parent {
    int width = 32, height = 32;

    CGRect frame = [parent frame]; //[[UIScreen mainScreen] applicationFrame];
    int x = frame.size.width;
    int y = frame.size.height;

    frame = CGRectMake((x - width) / 2, (y - height) / 2, width, height);
    UIActivityIndicatorView* progressInd = [[UIActivityIndicatorView alloc] initWithFrame:frame];
    [progressInd startAnimating];
    progressInd.activityIndicatorViewStyle = UIActivityIndicatorViewStyleWhiteLarge;


//    frame = CGRectMake((x - 140)/2, (y - height) / 2 + height, 140, 30);
//    UILabel *waitingLable = [[UILabel alloc] initWithFrame:frame];
//    waitingLable.text = @"Proccesing...";
//    waitingLable.textColor = [UIColor whiteColor];
//    waitingLable.font = [UIFont systemFontOfSize:15];
//    waitingLable.backgroundColor = [UIColor clearColor];

    frame = [parent frame];
    UIView *theView = [[UIView alloc] initWithFrame:frame];
    theView.backgroundColor = [UIColor blackColor];
    theView.alpha = 0.8;

    [theView addSubview:progressInd];
// [theView addSubview:waitingLable];

    [progressInd release];
//    [waitingLable release];

    [theView setTag:9999];
    [parent addSubview:theView];
    [theView release];
}
+(void)hideWaiting:(UIView *)parent {
    [[parent viewWithTag:9999] removeFromSuperview];
}
+(void)showWaiting:(UIView *)parent {
    int width = 32, height = 32;

    CGRect frame = [parent frame]; //[[UIScreen mainScreen] applicationFrame];
    int x = frame.size.width;
    int y = frame.size.height;

    frame = CGRectMake((x - width) / 2, (y - height) / 2, width, height);
    UIActivityIndicatorView* progressInd = [[UIActivityIndicatorView alloc] initWithFrame:frame];
    [progressInd startAnimating];
    progressInd.activityIndicatorViewStyle = UIActivityIndicatorViewStyleWhiteLarge;


//    frame = CGRectMake((x - 140)/2, (y - height) / 2 + height, 140, 30);
//    UILabel *waitingLable = [[UILabel alloc] initWithFrame:frame];
//    waitingLable.text = @"Proccesing...";
//    waitingLable.textColor = [UIColor whiteColor];
//    waitingLable.font = [UIFont systemFontOfSize:15];
//    waitingLable.backgroundColor = [UIColor clearColor];

    frame = [parent frame];
    UIView *theView = [[UIView alloc] initWithFrame:frame];
    theView.backgroundColor = [UIColor blackColor];
    theView.alpha = 0.8;

    [theView addSubview:progressInd];
// [theView addSubview:waitingLable];

    [progressInd release];
//    [waitingLable release];

    [theView setTag:9999];
    [parent addSubview:theView];
    [theView release];
}
+(void)hideWaiting:(UIView *)parent {
    [[parent viewWithTag:9999] removeFromSuperview];
}

13. 设置View的圆角：

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// 首先应用 #import <QuartzCore/QuartzCore.h>
view.layer.cornerRadius = 10;
view.layer.masksToBounds = YES;
// 首先应用 #import <QuartzCore/QuartzCore.h>
view.layer.cornerRadius = 10;
view.layer.masksToBounds = YES;

14.随机数：

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srandom(time(NULL)); //随机数种子
id d = random(); // 随机数
srandom(time(NULL)); //随机数种子
id d = random(); // 随机数

15.视频播放：

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MPMoviePlayerController *moviePlayer;
   moviePlayer = [[MPMoviePlayerController alloc]
                  initWithContentURL:[NSURL fileURLWithPath:[[NSBundle mainBundle] pathForResource:@"Movie" ofType:@"m4v"]]];
   //初始化视频播放器对象，并传入被播放文件的地址
   moviePlayer.movieControlMode = MPMovieControlModeDefault;
   [moviePlayer play];
   //此处有内存溢出
MPMoviePlayerController *moviePlayer;
    moviePlayer = [[MPMoviePlayerController alloc]
                   initWithContentURL:[NSURL fileURLWithPath:[[NSBundle mainBundle] pathForResource:@"Movie" ofType:@"m4v"]]];
    //初始化视频播放器对象，并传入被播放文件的地址
    moviePlayer.movieControlMode = MPMovieControlModeDefault;
    [moviePlayer play];
    //此处有内存溢出

16. 3. 启动界面显示：

iPhone软件启动后的第一屏图片是非常重要的往往就是loading载入中的意思。设置它说来也简单，但是却无比重要

只需要在resource里面将你希望设置的图片更名为Default.png，这个图片就可以成为iPhone载入的缺省图片

17.iPhone的系统目录:

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//得到Document目录：
NSArray *paths = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES);
NSString *documentsDirectory = [paths objectAtIndex:0];
//得到temp临时目录：
NSString *tempPath = NSTemporaryDirectory();
//得到目录上的文件地址：
NSString *文件地址 = [目录地址 stringByAppendingPathComponent:@"文件名.扩展名"];
//得到Document目录：
NSArray *paths = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES);
NSString *documentsDirectory = [paths objectAtIndex:0];
//得到temp临时目录：
NSString *tempPath = NSTemporaryDirectory();
//得到目录上的文件地址：
NSString *文件地址 = [目录地址 stringByAppendingPathComponent:@"文件名.扩展名"];

18.状态栏显示Indicator：

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[UIApplication sharedApplication].networkActivityIndicatorVisible = YES;
[UIApplication sharedApplication].networkActivityIndicatorVisible = YES;

本文来自****博客，转载请标明出处：http://blog.****.net/ipromiseu/archive/2010/08/22/5830398.aspx

iPhone3开发基础教程中一部分有用代码片段(1)

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