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