关于Iphone开发得一些案例及常用知识（转过来的参考用）

tabBar透明的效果
http://www.cocoachina.com/bbs/read.php?tid=17815

[[UIApplication sharedApplication] setStatusBarStyle:UIStatusBarStyleBlackTranslucent animated:YES];

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设置Table Cell的背景图的公用类代码
http://www.cocoachina.com/downloads/video/2010/0521/1531.html

#import <Foundation/Foundation.h>
#import <UIKit/UIKit.h>

@interface UITableViewCell (UITableViewCellExt)

- (void)setBackgroundImage:(UIImage*)image;
- (void)setBackgroundImageByName:(NSString*)imageName;

@end

#import "UITableViewCellExt.h"

@implementation UITableViewCell (UITableViewCellExt)

- (void)setBackgroundImage:(UIImage*)image
{
UIImageView *imageView = [[UIImageView alloc] initWithImage:image];
imageView.contentMode = UIViewContentModeCenter;
self.backgroundView = imageView;
[imageView release];

}

- (void)setBackgroundImageByName:(NSString*)imageName
{
[self setBackgroundImage:[UIImage imageNamed:imageName]];
}
@end

调 用示例：

// Customize the appearance of table view cells.
- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath {

static NSString *CellIdentifier = @"Cell";

UITableViewCell *cell = [tableView dequeueReusableCellWithIdentifier:CellIdentifier];

if (cell == nil) {
cell = [[[UITableViewCell alloc] initWithStyle:UITableViewCellStyleDefault reuseIdentifier:CellIdentifier] autorelease];

cell.selectionStyle = UITableViewCellSelectionStyleNone;

[cell setBackgroundImageByName:@"text-background.png"];

}

return cell;
}

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iPhone SDK 解析 xml的官方示例代码
http://www.cocoachina.com/downloads/video/2010/0520/1523.html

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把图片切成圆角代码
http://www.cocoachina.com/bbs/read.php?tid-1757.html

static void addRoundedRectToPath(CGContextRef context, CGRect rect, float ovalWidth,
float ovalHeight)
{
float fw, fh;
if (ovalWidth == 0 || ovalHeight == 0) {
CGContextAddRect(context, rect);
return;
}

CGContextSaveGState(context);
CGContextTranslateCTM(context, CGRectGetMinX(rect), CGRectGetMinY(rect));
CGContextScaleCTM(context, ovalWidth, ovalHeight);
fw = CGRectGetWidth(rect) / ovalWidth;
fh = CGRectGetHeight(rect) / ovalHeight;

CGContextMoveToPoint(context, fw, fh/2); // Start at lower right corner
CGContextAddArcToPoint(context, fw, fh, fw/2, fh, 1); // Top right corner
CGContextAddArcToPoint(context, 0, fh, 0, fh/2, 1); // Top left corner
CGContextAddArcToPoint(context, 0, 0, fw/2, 0, 1); // Lower left corner
CGContextAddArcToPoint(context, fw, 0, fw, fh/2, 1); // Back to lower right

CGContextClosePath(context);
CGContextRestoreGState(context);
}

+ (id) createRoundedRectImage:(UIImage*)image size:(CGSize)size
{
// the size of CGContextRef
int w = size.width;
int h = size.height;

UIImage *img = image;
CGColorSpaceRef colorSpace = CGColorSpaceCreateDeviceRGB();
CGContextRef context = CGBitmapContextCreate(NULL, w, h, 8, 4 * w, colorSpace, kCGImageAlphaPremultipliedFirst);
CGRect rect = CGRectMake(0, 0, w, h);

CGContextBeginPath(context);
addRoundedRectToPath(context, rect, 10, 10);
CGContextClosePath(context);
CGContextClip(context);
CGContextDrawImage(context, CGRectMake(0, 0, w, h), img.CGImage);
CGImageRef imageMasked = CGBitmapContextCreateImage(context);
CGContextRelease(context);
CGColorSpaceRelease(colorSpace);
return [UIImage imageWithCGImage:imageMasked];
}

直接调用 createRoundedRectImage....
返回圆角图片
圆角大小自行修改 CGContextAddArcToPoint....

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检测iPhone／iPod Touch／iPad设备类型
http://www.cocoachina.com/bbs/read.php?tid-20994.html

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iPhone上气泡式聊天的代码
http://www.cocoachina.com/downloads/video/2010/0510/1379.html

聊天程序--(UDP通信，bubble代码）
http://www.cocoachina.com/bbs/read.php?tid-24324-fpage-2.html

第一个iphone小程序（实现聊天功能）
http://www.cocoachina.com/bbs/read.php?tid-24956-fpage-2.html
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ExpanderController可伸缩框架的代码
http://www.cocoachina.com/downloads/video/2010/0510/1368.html
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一段模拟水波纹的代码，希望对大家有用
http://www.cocoachina.com/downloads/video/2010/0506/1351.html
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根据经纬度计算两点之间距离的Obcective-C代码
http://www.cocoachina.com/downloads/video/2010/0506/1344.html

其中其中er 就是地球椭球半径，对于google map使用 6378137 就可以了。函数的调用非常简单，几乎使用任何平台:)
#define PI 3.1415926
double LantitudeLongitudeDist(double lon1,double lat1,
double lon2,double lat2)
{
double er = 6378137; // 6378700.0f;
//ave. radius = 6371.315 (someone said more accurate is 6366.707)
//equatorial radius = 6378.388
//nautical mile = 1.15078
double radlat1 = PI*lat1/180.0f;
double radlat2 = PI*lat2/180.0f;
//now long.
double radlong1 = PI*lon1/180.0f;
double radlong2 = PI*lon2/180.0f;
if( radlat1 < 0 ) radlat1 = PI/2 + fabs(radlat1);// south
if( radlat1 > 0 ) radlat1 = PI/2 - fabs(radlat1);// north
if( radlong1 < 0 ) radlong1 = PI*2 - fabs(radlong1);//west
if( radlat2 < 0 ) radlat2 = PI/2 + fabs(radlat2);// south
if( radlat2 > 0 ) radlat2 = PI/2 - fabs(radlat2);// north
if( radlong2 < 0 ) radlong2 = PI*2 - fabs(radlong2);// west
//spherical coordinates x=r*cos(ag)sin(at), y=r*sin(ag)*sin(at), z=r*cos(at)
//zero ag is up so reverse lat
double x1 = er * cos(radlong1) * sin(radlat1);
double y1 = er * sin(radlong1) * sin(radlat1);
double z1 = er * cos(radlat1);
double x2 = er * cos(radlong2) * sin(radlat2);
double y2 = er * sin(radlong2) * sin(radlat2);
double z2 = er * cos(radlat2);
double d = sqrt((x1-x2)*(x1-x2)+(y1-y2)*(y1-y2)+(z1-z2)*(z1-z2));
//side, side, side, law of cosines and arccos
double theta = acos((er*er+er*er-d*d)/(2*er*er));
double dist = theta*er;
return dist;
}
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巴黎自行车信息查询软件源码
http://www.cocoachina.com/downloads/video/2010/0429/1266.html
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自制 iPhone DataGrid 数据列表组件，支持行列锁定
http://www.cocoachina.com/downloads/video/2010/0429/1267.html
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iPhone播放本地视频的代码
http://www.cocoachina.com/downloads/video/2010/0428/1260.html
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UIWebView里面长按一个链接后自定义弹出菜单
http://www.cocoachina.com/iphonedev/sdk/2010/0716/1879.html
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iPhone上画面切换特效及代码
http://www.cocoachina.com/downloads/video/2010/0419/1123.html
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永远的扫雷英雄(开源) 登场
http://www.cocoachina.com/bbs/read.php?tid-12818.html
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在iPhone中实现图片缩放
http://www.cocoachina.com/iphonedev/toolthain/2009/0611/198.html
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创建iPhone锁定划动条的方法
http://www.cocoachina.com/iphonedev/toolthain/2009/0611/224.html
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UICoverFlowLayer例子：制作iPhone的Cover Flow效果
http://www.cocoachina.com/iphonedev/toolthain/2009/0611/196.html
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如何在iPhone程序读取数据时显示进度窗
http://www.cocoachina.com/iphonedev/toolthain/2009/0611/173.html
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UITabBarController 保存调整后的more选项（增加所有TabBar之间切换).
http://www.cocoachina.com/bbs/read.php?tid-12424.html
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NSStirng、NSArray、以及枚举(Method小集合)
http://www.cocoachina.com/bbs/read.php?tid-7735.html
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UIview动画
http://www.cocoachina.com/bbs/read.php?tid-8035-keyword-demo.html

http://www.cocoachina.com/bbs/read.php?tid-11343.html
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搜索功能
http://www.cocoachina.com/bbs/read.php?tid-5869.html

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UILabel显示换行的方法
UILabel*label;

//设置换行
label.lineBreakMode = UILineBreakModeWordWrap;
label.numberOfLines = 0;

换行符还是\n
比如NSString * xstring=@"lineone\nlinetwo"

记得要把label的高度设置的足够显示多行内容。

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手把手教你做iphone的soap应用(webservice)
http://www.cocoachina.com/bbs/read.php?tid-16561-fpage-2.html
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点击Table一行弹出下拉一排按钮的TableViewCell类
http://www.cocoachina.com/bbs/read.php?tid-23065-fpage-2.html

http://www.cocoachina.com/bbs/read.php?tid=21494&page=1#131711
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一些iPhone开源项目代码
http://www.cocoachina.com/bbs/read.php?tid-4532-fpage-2.htm
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<iOS4>后台运行(Multitasking)以及本地通知(Local Notifications) 有图，有书，有代码，统一打包
http://www.cocoachina.com/bbs/read.php?tid-20423-fpage-2.html
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开源一个基于MultiTouch事件图片移动和缩放的demo
http://www.cocoachina.com/bbs/read.php?tid-25387-fpage-2.html