cocoa论坛会员源码分享

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开机动画（会员qqy620）

上传一个开机动画Demo

附件：

/cms/uploads/soft/131107/4196-13110G05F0.zip

原帖：http://www.cocoachina.com/bbs/read.php?tid=137552

NSDateFormatter整理（会员qqy620）

NSDate对象包含两个部分，日期（Date）和时间（Time）。格式化的时间字符串主要也是针对日期和时间的

1、基础用法

NSDate* now = [NSDate date];

NSDateFormatter* fmt = [[NSDateFormatter alloc] init];

fmt.dateStyle = kCFDateFormatterShortStyle;

fmt.timeStyle = kCFDateFormatterShortStyle;

fmt.locale = [[NSLocale alloc] initWithLocaleIdentifier:@"en_US"];

NSString* dateString = [fmt stringFromDate:now];

NSLog(@"%@", dateString);

[fmt release];

打印输出：10/29/12, 2:27 PM

这使用的系统提供的格式化字符串，通过 fmt.dateStyle 和 fmt.timeStyle 进行的设置。实例中使用的参数是 kCFDateFormatterShortStyle，此外还有：

typedef CF_ENUM(CFIndex, CFDateFormatterStyle) { // date and time format styles

kCFDateFormatterNoStyle = 0, // 无输出

kCFDateFormatterShortStyle = 1, // 10/29/12, 2:27 PM

kCFDateFormatterMediumStyle = 2, // Oct 29, 2012, 2:36:59 PM

kCFDateFormatterLongStyle = 3, // October 29, 2012, 2:38:46 PM GMT+08:00

kCFDateFormatterFullStyle = 4 // Monday, October 29, 2012, 2:39:56 PM China Standard Time

};

自己写的date转换成nsstring:

2. 自定义区域语言

如上实例中，我们使用的是区域语言是 en_US，指的是美国英语。如果我们换成简体中文，则代码是：

fmt.locale = [[NSLocale alloc] initWithLocaleIdentifier:@"zh_CN"];

则对应的输出为：

typedef CF_ENUM(CFIndex, CFDateFormatterStyle) { // date and time format styles

kCFDateFormatterNoStyle = 0, // 无输出

kCFDateFormatterShortStyle = 1, // 12-10-29 下午2:52

kCFDateFormatterMediumStyle = 2, // 2012-10-29 下午2:51:43

kCFDateFormatterLongStyle = 3, // 2012年10月29日 GMT+0800下午2时51分08秒

kCFDateFormatterFullStyle = 4 // 2012年10月29日星期一中国标准时间下午2时46分49秒

};

世界通用的区域语言代码，详见 International Components for Unicode (ICU), http://userguide.icu-project.org/formatparse/datetime

3. 自定义日期时间格式

NSDateFormatter提供了自定义日期时间的方法，主要是通过设置属性 dateFormat，常见的设置如下：

NSDate* now = [NSDate date];

NSDateFormatter* fmt = [[NSDateFormatter alloc] init];

fmt.locale = [[NSLocale alloc] initWithLocaleIdentifier:@"zh_CN"];

fmt.dateFormat = @"yyyy-MM-dd'T'HH:mm:ss";

NSString* dateString = [fmt stringFromDate:now];

NSLog(@"%@", dateString);

[fmt release];

打印输出：2012-10-29T16:08:40

除了上面列出的，还可以指定很多格式，详见http://userguide.icu-project.org/formatparse/datetime。

结合设置Locale，还可以打印出本地化的字符串信息。

NSDate* now = [NSDate date];

NSDateFormatter* fmt = [[NSDateFormatter alloc] init];

fmt.locale = [[NSLocale alloc] initWithLocaleIdentifier:@"zh_CN"];

fmt.dateFormat = @"yyyy-MM-dd a HH:mm:ss EEEE";

NSString* dateString = [fmt stringFromDate:now];

NSLog(@"\n%@", dateString);

[fmt release];

打印输出：2012-10-29 下午 16:25:27 星期一

4. 自定义月份星期等字符

NSDateFormatter中同样提供了相应的方式，去修改这些字符。一般情况下，使用相应区域语言下面的默认字符就OK了。但是你的确有这个需求，那么也是可以办到的。相应的方法非常多，如下：

Managing AM and PM Symbols

– AMSymbol

– setAMSymbol:

– PMSymbol

– setPMSymbol:

Managing Weekday Symbols

– weekdaySymbols

– setWeekdaySymbols:

– shortWeekdaySymbols

– setShortWeekdaySymbols:

– veryShortWeekdaySymbols

– setVeryShortWeekdaySymbols:

– standaloneWeekdaySymbols

– setStandaloneWeekdaySymbols:

– shortStandaloneWeekdaySymbols

– setShortStandaloneWeekdaySymbols:

– veryShortStandaloneWeekdaySymbols

– setVeryShortStandaloneWeekdaySymbols:

Managing Month Symbols

– monthSymbols

– setMonthSymbols:

– shortMonthSymbols

– setShortMonthSymbols:

– veryShortMonthSymbols

– setVeryShortMonthSymbols:

– standaloneMonthSymbols

– setStandaloneMonthSymbols:

– shortStandaloneMonthSymbols

– setShortStandaloneMonthSymbols:

– veryShortStandaloneMonthSymbols

– setVeryShortStandaloneMonthSymbols:

Managing Quarter Symbols

– quarterSymbols

– setQuarterSymbols:

– shortQuarterSymbols

– setShortQuarterSymbols:

– standaloneQuarterSymbols

– setStandaloneQuarterSymbols:

– shortStandaloneQuarterSymbols

– setShortStandaloneQuarterSymbols:

Managing Era Symbols

– eraSymbols

– setEraSymbols:

– longEraSymbols

– setLongEraSymbols:

date转换成nsstring方法：

- (NSString *)dateFromString:(NSString *)dateString

{

NSDateFormatter *dateFormat = [[NSDateFormatter alloc] init];

[dateFormat setDateFormat:@"yyyy-MM-dd HH:mm:ss"];

NSDate *date = [dateFormat dateFromString:dateString];

[dateFormat setDateFormat:@"yyyy-MM-dd"];

NSString *srting = [dateFormat stringFromDate:date];

[dateFormat release];

return srting;

}

带样式的时间转换

- (NSString *)dateFromStringWithDateStyle:(NSDateFormatterStyle)dateStyle

{

NSDate* now = [NSDate date];

NSDateFormatter* fmt = [[NSDateFormatter alloc] init];

fmt.dateStyle = dateStyle;

fmt.timeStyle = dateStyle;

fmt.locale = [[NSLocale alloc] initWithLocaleIdentifier:@"zh_CN"];

NSString* dateString = [fmt stringFromDate:now];

[fmt release];

return dateString;

}

下面上传一个Dmeo

附件：

/cms/uploads/soft/131107/4196-13110G05I2.zip

原帖：http://www.cocoachina.com/bbs/read.php?tid=134821

解决UITextView的placeholder属性（会员qqy620）

解决UITextView的placeholder属性，并解决了键盘遮挡问题

附件：

/cms/uploads/soft/131107/4196-13110G05J9.zip

原帖：http://www.cocoachina.com/bbs/read.php?tid=134401

iPhone/iPad全屏截图Demo （会员qqy620）

全屏截图:

UIWindow *screenWindow = [[UIApplication sharedApplication] keyWindow];

UIGraphicsBeginImageContext(screenWindow.frame.size);

[screenWindow.layer renderInContext:UIGraphicsGetCurrentContext()];

UIImage *viewImage = UIGraphicsGetImageFromCurrentImageContext();

UIGraphicsEndImageContext();

UIImageWriteToSavedPhotosAlbum(viewImage, nil, nil, nil);//保存到相册

CGRect rect = self.view.frame;

UIGraphicsBeginImageContext(rect.size);

CGContextRef context = UIGraphicsGetCurrentContext();

[self.view.layer renderInContext:context];

UIImage *image = UIGraphicsGetImageFromCurrentImageContext();

UIGraphicsEndImageContext();

UIImageWriteToSavedPhotosAlbum(image, nil, nil, nil);

CGRect rect2 = CGRectMake(0, 0, 320 , 480);//创建矩形框

_imageView.image=[UIImage imageWithCGImage:CGImageCreateWithImageInRect([image CGImage], rect2)];//此处的_imageView是自定义的UIImageView，截的图在这里显示。

参考：http://www.cocoachina.com/bbs/read.php?tid=114736

截取本区域(self.view):

UIGraphicsBeginImageContext(CGSizeMake(self.view.frame.size.width, self.view.frame.size.height));

[self.view.layer renderInContext:UIGraphicsGetCurrentContext()];

UIImage *viewImage = UIGraphicsGetImageFromCurrentImageContext();

UIGraphicsEndImageContext();

UIImageWriteToSavedPhotosAlbum(viewImage, nil, nil, nil);

全屏截图:

UIWindow *screenWindow = [[UIApplication sharedApplication] keyWindow];

UIGraphicsBeginImageContext(screenWindow.frame.size);

[screenWindow.layer renderInContext:UIGraphicsGetCurrentContext()];

UIImage *viewImage = UIGraphicsGetImageFromCurrentImageContext();

UIGraphicsEndImageContext();

UIImageWriteToSavedPhotosAlbum(viewImage, nil, nil, nil);

以上2种方法真机和模拟器都可以运行.在photo.app里可以看到照片

苹果最新开放的接口函数(全屏截图),已经有人试过了,不会reject:

CGImageRef UIGetScreenImage();

CGImageRef img = UIGetScreenImage();

UIImage* scImage=[UIImage imageWithCGImage:img];

UIImageWriteToSavedPhotosAlbum(scImage, nil, nil, nil);

It still works,but only on-device (not in simulator) .

截图另存为指定名字:

UIWindow *screenWindow = [[UIApplication sharedApplication] keyWindow];

UIGraphicsBeginImageContext(screenWindow.frame.size);

[screenWindow.layer renderInContext:UIGraphicsGetCurrentContext()];

UIImage *screenshot = UIGraphicsGetImageFromCurrentImageContext();

UIGraphicsEndImageContext();

NSData *screenshotPNG = UIImagePNGRepresentation(screenshot);

NSArray *paths = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES);

NSString *documentsDirectory = [paths objectAtIndex:0];

NSError *error = nil;

[screenshotPNG writeToFile:[documentsDirectory stringByAppendingPathComponent:@"screenshot.png"] options:NSAtomicWrite error:&error];

部分代码来自:http://stackoverflow.com/questions/692464/emailing-full-screen-of-iphone-app

没有ipad真机截图发布app的可以用此方法做个透明按钮点,哈哈.

截取本区域(self.view):

UIGraphicsBeginImageContext(CGSizeMake(self.view.frame.size.width, self.view.frame.size.height));

[self.view.layer renderInContext:UIGraphicsGetCurrentContext()];

UIImage *viewImage = UIGraphicsGetImageFromCurrentImageContext();

UIGraphicsEndImageContext();

UIImageWriteToSavedPhotosAlbum(viewImage, nil, nil, nil);

全屏截图:

UIWindow *screenWindow = [[UIApplication sharedApplication] keyWindow];

UIGraphicsBeginImageContext(screenWindow.frame.size);

[screenWindow.layer renderInContext:UIGraphicsGetCurrentContext()];

UIImage *viewImage = UIGraphicsGetImageFromCurrentImageContext();

UIGraphicsEndImageContext();

UIImageWriteToSavedPhotosAlbum(viewImage, nil, nil, nil);

以上2种方法真机和模拟器都可以运行.在photo.app里可以看到照片

苹果最新开放的接口函数(全屏截图),已经有人试过了,不会reject:

CGImageRef UIGetScreenImage();

CGImageRef img = UIGetScreenImage();

UIImage* scImage=[UIImage imageWithCGImage:img];

UIImageWriteToSavedPhotosAlbum(scImage, nil, nil, nil);

It still works,but only on-device (not in simulator) .

截图另存为指定名字:

UIWindow *screenWindow = [[UIApplication sharedApplication] keyWindow];

UIGraphicsBeginImageContext(screenWindow.frame.size);

[screenWindow.layer renderInContext:UIGraphicsGetCurrentContext()];

UIImage *screenshot = UIGraphicsGetImageFromCurrentImageContext();

UIGraphicsEndImageContext();

NSData *screenshotPNG = UIImagePNGRepresentation(screenshot);

NSArray *paths = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES);

NSString *documentsDirectory = [paths objectAtIndex:0];

NSError *error = nil;

[screenshotPNG writeToFile:[documentsDirectory stringByAppendingPathComponent:@"screenshot.png"] options:NSAtomicWrite error:&error];

部分代码来自:http://stackoverflow.com/questions/692464/emailing-full-screen-of-iphone-app

附件：

/cms/uploads/soft/131107/4196-13110G10101.zip

原帖：http://www.cocoachina.com/bbs/read.php?tid=124528

分享到微信Demo（会员qqy620）

参考官方文档;http://open.weixin.qq.com/document/gettingstart/ios/?lang=zh_CN; http://open.weixin.qq.com/document/sdk/ios/?lang=zh_CN；

注意下：如果使用XCode 4.3及以下版本，使用libWeChatSDK.a；如果使用XCode 4.5及以上版本，使用libWeChatSDK_armv7_v7s.a ，XCode 4.4版本，也是使用libWeChatSDK_armv7_v7s.a ，官方没有提到4.4版本。

官方的Demo看的很晕，自己以重新整理了一下。加了点功能：跳转到appstore上去下载微信：NSString *weiXinLink = @"itms-apps://itunes.apple.com/cn/app/wei-xin/id414478124?mt=8";

[[UIApplication sharedApplication] openURL:[NSURL URLWithString:weiXinLink]];

附件：

/cms/uploads/soft/131107/4196-13110G10119.zip

原帖：http://www.cocoachina.com/bbs/read.php?tid=123883