iOS每日一记————————一些常用的小技巧(三)

在 Quartz
中如何设置旋转点

UIImageView *imageView = [[UIImageView alloc] initWithImage:[UIImageimageNamed:@"bg.png"]];

imageView.layer.anchorPoint = CGPointMake(0.5, 1.0);这个是把旋转点设置为底部中间。记住是在
QuartzCore.framework
中才得到支

持

创建.plist
文件并存储

NSString *errorDesc; //用来存放错误信息

NSMutableDictionary *rootObj = [NSMutableDictionarydictionaryWithCapacity:4]; //NSDictionary, NSData
等文件可以直接转化为 plist
文件

NSDictionary *innerDict;NSString *name;

Player *player;

NSInteger saveIndex;

for(int i = 0; i < [playerArray count]; i++) {player = nil;

player = [playerArray objectAtIndex:i];if(player == nil)

break;

name = player.playerName;// This "Player1" denotes the player name could

also be the computer name

innerDict = [self getAllNodeInfoToDictionary:player];

[rootObj setObject:innerDict forKey:name]; // This "Player1" denotes theperson who start this game

}

player = nil;NSData

dataFromPropertyList:(id)rootObjerrorDescription:&errorDesc];

*plistData

= [NSPropertyListSerializationformat:NSPropertyListXMLFormat_v1_0

红色部分可以忽略,只是给 rootObj
添加一点内容。这个 plistData
为创建好的plist
文件,用其 writeToFile
方法就可以写成文件。下面是代码:

/*得到移动设备上的文件存放位置*/

NSString *documentsPath = [self getDocumentsDirectory];

NSString *savePath = [documentsPath

stringByAppendingPathComponent:@"save.plist"];

/*存文件*/

if (plistData) {

[plistData writeToFile:savePath atomically:YES];}

else {

NSLog(errorDesc);

[errorDesc release];

}

- (NSString *)getDocumentsDirectory {

NSArray *paths

NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES);return [paths objectAtIndex:0];

}

读取一般性文档文件

NSString *tmp;

NSArray *lines; /*将文件转化为一行一行的*/

lines = [[NSString stringWithContentsOfFile:@"testFileReadLines.txt"]

componentsSeparatedByString:@"\n"];NSEnumerator *nse = [lines objectEnumerator];

// 读取<>里的内容

while(tmp = [nse nextObject]) {

}

= [[NSMutableDictionary

alloc]

NSString *stringBetweenBrackets = nil;

NSScanner *scanner = [NSScanner scannerWithString:tmp];[scanner scanUpToString:@"<" intoString:nil];

[scanner scanString:@"<" intoString:nil];

[scanner scanUpToString:@">" intoString:&stringBetweenBrackets];

NSLog([stringBetweenBrackets description]);

}

隐藏 NavigationBar

[self.navigationController setNavigationBarHidden:YES animated:YES];

如何在 iPhone
程序读取数据时显示进度窗

下面代码说明如何使用 iPhone
非官方 SDK
在读取数据时显示进度条。以下代码参考了 MobileRss。

定义头文件:

#import "uikit/UIProgressHUD.h"

@interface EyeCandy : UIApplication {UIProgressHUD *progress;

}

- (void) showProgressHUD:(NSString *)label withWindow:(UIWindow *)wwithView:(UIView *)v withRect:(struct CGRect)rect;

- (void) hideProgressHUD;.@end

上面的引号要改成<>。

import "EyeCandy.h"

@implementation EyeCandy

- (void)showProgressHUD:(NSString *)label withWindow:(UIWindow *)wwithView:(UIView *)v withRect:(struct CGRect)rect

{

progress = [[UIProgressHUD alloc] initWithWindow: w];[progress setText: label];

[progress drawRect: rect];

[progress show: YES];

[v addSubview:progress];}

- (void)hideProgressHUD{

[progress show: NO];

[progress removeFromSuperview];}

@end

使用下面代码调用:

// Setup Eye Candy View

_eyeCandy = [[[EyeCandy alloc] init] retain];

// Call loading display

[_eyeCandy showProgressHUD:@"Loading ..." withWindow:window withView:mainViewwithRect:CGRectMake(0.0f, 100.0f, 320.0f,
50.0f)];

// When finished for hiding the "loading text"[_eyeCandy hideProgressHUD];

NSNotificationCenter
带参数发送

MPMoviePlayerController* theMovie = [[MPMoviePlayerControlleralloc]initWithContentURL:[NSURL fileURLWithPath:[[[tableTitles objectForKey:keyIndex]objectAtIndex:row] objectAtIndex:3] ]];

[[NSNotificationCenter defaultCenter]selector:@selector(myMovieFinishedCallback:)name:MPMoviePlayerPlaybackDidFinishNotification object:theMovie];

[theMovie play];-(void)myMovieFinishedCallback:(NSNotification*)aNotification{

MPMoviePlayerController *theMovie = [aNotification object];

[[NSNotificationCenter defaultCenter]name:MPMoviePlayerPlaybackDidFinishNotification object:theMovie];

// Release the movie instance [theMovie release];}

------------

addObserver:self

MPMoviePlayerController* theMovie = [[MPMoviePlayerControlleralloc]initWithContentURL:[NSURL fileURLWithPath:[[[tableTitles objectForKey:keyIndex]

removeObserver:self

objectAtIndex:row] objectAtIndex:3] ]];

[[NSNotificationCenter defaultCenter] addObserver:selfselector:@selector(myMovieFinishedCallback:)name:MPMoviePlayerPlaybackDidFinishNotification
object:theMovie userInfo:dic];

[theMovie play];

-(void)myMovieFinishedCallback:(NSNotification*)aNotification

{

MPMoviePlayerController *theMovie = [aNotification object];

[[NSNotificationCenter defaultCenter] removeObserver:selfname:MPMoviePlayerPlaybackDidFinishNotification object:theMovie];

// Release the movie instance [theMovie release];

}

获取 IOS
设备的基本信息系统唯一标识

是什么设备:iPad
还是 iPhone
等iOS
版本号

系统名称

[[UIDevice currentDevice] uniqueIdentifier],

[[UIDevice currentDevice] localizedModel],[[UIDevice currentDevice] systemVersion],[[UIDevice currentDevice] systemName],[[UIDevice currentDevice] model]];

用 NSDateFormatter
调整时间格式的代码

在开发 iOS
程序时,有时候需要将时间格式调整成自己希望的格式,这个时候我们可以用
NSDateFormatter
类来处理。

例如:

//实例化一个
NSDateFormatter
对象

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

//设定时间格式,这里可以设置成自己需要的格式

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

//用[NSDate date]可以获取系统当前时间

NSString *currentDateStr = [dateFormatter stringFromDate:[NSDate date]];

//输出格式为:2010-10-27 10:22:13

NSLog(@”%@”,currentDateStr);

//alloc
后对不使用的对象别忘了 release

[dateFormatter release];

UIView
设置成圆角方法

m_mainImgView.layer.cornerRadius = 6;m_mainImgView.layer.masksToBounds = YES;

iphone
更改键盘右下角按键的 type

创建 mySearchBar:

mySearchBar = [[UISearchBar alloc] initWithFrame:CGRectMake(0.0,SEARCH_HEIGHT)];

mySearchBar.placeholder = curPath;[mySearchBar setDelegate:self];//tableView.tableHeaderView =mySearchBar;[self.view addSubview:mySearchBar];

0,320,

更改按键的 keyType(默认是
return,这里将它更改成
done,当然还可以更改成其他的):UITextField *searchField = [[mySearchBar subviews]
lastObject];

[searchField setReturnKeyType:UIReturnKeyDone];

[mySearchBar release];