新手入门常用的iPhone代码.docx
- 文档编号:3816661
- 上传时间:2022-11-25
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- 页数:17
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新手入门常用的iPhone代码.docx
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新手入门常用的iPhone代码
iPhone代码片段收集
1. stringWithFormat用法:
[NSString stringWithFormat:
@"Hight:
%d°%@ Low:
%d°%@", [Temp],@"C",[lTemp],@"C"];
NSStringtoNSData:
NSString*str=@"kilonet";
NSData*data=[strdataUsingEncoding:
NSUTF8StringEncoding];
2.NSDate用法:
NSDate *today;
NSDate *tomorrow;
today = [NSDate date];
tomorrow = [NSDate dateWithTimeInterval:
(i*24*60*60) sinceDate:
today]; //可能有更好的
Dateformat用法:
-(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:
代码
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];
获取毫秒时间:
代码
NSDateFormatter *dateFormatter = [[NSDateFormatter alloc] init];
[dateFormatter setDateStyle:
NSDateFormatterMediumStyle];
[dateFormatter setTimeStyle:
NSDateFormatterShortStyle];
//[dateFormatter setDateFormat:
@"hh:
mm:
ss"]
[dateFormatter setDateFormat:
@"yyyy-MM-dd HH:
mm:
ss.SSS"];
NSLog(@"Date%@", [dateFormatter stringFromDate:
[NSDate date]]);
[dateFormatter release];
3. NSCalendar用法:
-(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:
// 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:
[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
[selfperformSelectorOnMainThread:
@selector(moveToMain) withObject:
nil waitUntilDone:
FALSE];
6.定时器NSTimer用法:
代码
// 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];
} 定时器停止使用:
[timer invalidate];
timer = nil;
7.用户缺省值NSUserDefaults读取:
//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:
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:
-(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:
KiloNetAppDelegate *appdelegate = (KiloNetAppDelegate *)[[UIApplication sharedApplication] delegate];
11.键盘处理系列
//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:
半透明层
+(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:
// 首先应用 #import
view.layer.cornerRadius = 10;
view.layer.masksToBounds = YES;
14.UIWebView显示本地图片(目前有点问题,无法正确显示图片):
代码
NSString *imagePath = [[NSBundle mainBundle] resourcePath];
imagePath = [imagePath stringByReplacingOccurrencesOfString:
@"/" withString:
@"//"];
imagePath = [imagePath stringByReplacingOccurrencesOfString:
@" " withString:
@"%20"];
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