iphone开发小技巧汇总（1）

4.iphone之unichar和初始化

在iphone/mac开发中，unichar是两字节长的char，代表unicode的一个字符。但在xcode中，初始化unichar是个问题。如果像下面这样声明，会有warning"Multi-character character constant"。

unichar a = '国';

这是 因为C语言中两个单引号只能用于char。可以采用直接写文字编码的方式来初始化。

unichar a = 0x0100;

如果有很多个unichar怎么办？一个个去查表太麻烦了。可以采取变通的方法：

unichar a[10];

NSString *aString = @"一二三四五六七八九十";

for (int i = 0; i < 10; i++)

a[i] = [aString characterAtIndex:i];

6.iphone之iphone控件尺寸

7.iPhone之发送附件邮件代码

    MFMailComposeViewController *picker = [[MFMailComposeViewControlleralloc] init];
    picker.mailComposeDelegate = self;
    
    [pickersetSubject:@"I have a pencil for you"];
    NSString*databasePathFromApp = [[[NSBundle mainBundle] resourcePath]stringByAppendingPathComponent:@"10.pdf"];
    NSData*fileData = [NSDatadataWithContentsOfFile:databasePathFromApp];
    [pickeraddAttachmentData:fileData mimeType:@"application/pdf"fileName:@"15.pdf"];
    [pickeraddAttachmentData:fileData mimeType:@"application/pdf"fileName:@"16.pdf"];
    UIImage*roboPic = [UIImage imageNamed:@"1.png"];
    NSData*imageData = UIImageJPEGRepresentation(roboPic, 1);
    [pickeraddAttachmentData:imageData mimeType:@"image/jpg"fileName:@"1.png"];
    
    NSString*emailBody = @"This is a cool image of a robot Ifound.  Check it out!";
    [pickersetMessageBody:emailBody isHTML:YES];
    
    [selfpresentModalViewController:picker animated:YES];
    [pickerrelease];

NSString *iTunesLink =@"http://itunes.apple.com/us/app/id（产口id号）?mt=8";

[[UIApplication sharedApplication] openURL:[NSURLURLWithString:iTunesLink]];

UILabel *titleText =[[UILabel alloc] initWithFrame: CGRectMake(0, 0,200, 20)];
titleText.backgroundColor =[UIColor clearColor];
[titleText setFont:[UIFontsystemFontOfSize:15.0]];
[titleText setText:@"设置navigationItem标题的字体大小"];
self.navigationItem.titleView=titleText;//titleView
[titleText release];