{
NSError *error = NULL;
NSMutableString *dest=[NSMutableString stringWithCapacity:0];
NSRegularExpression *regex = [NSRegularExpression regularExpressionWithPattern:@"<a href=\".+?\">(.+?)</a>"
options:NSRegularExpressionCaseInsensitive
error:&error];
NSRegularExpression* regex2 = [[NSRegularExpression alloc] initWithPattern:@"(?<=>).*?(?=</a>)" options:NSRegularExpressionCaseInsensitive error:nil];
NSUInteger numberOfMatches = [regex numberOfMatchesInString:src
options:0
range:NSMakeRange(0, [src length])];
if (numberOfMatches !=0) {
[dest appendString:src];
[regex enumerateMatchesInString:src options:0 range:NSMakeRange(0, [src length])
usingBlock:^(NSTextCheckingResult *result, NSMatchingFlags flags, BOOL *stop) {
NSString*resultString = [src substringWithRange:[result range]];
NSString*link=[resultString substringWithRange:[[regex2 firstMatchInString:resultString options:0 range:NSMakeRange(0,[resultString length])] range]];
[dest replaceCharactersInRange:[result range] withString:link];
}];
return [dest stringByReplacingOccurrencesOfString:@"<br />" withString:@""];
} else {
return [src stringByReplacingOccurrencesOfString:@"<br />" withString:@""];
}
}
]]>- (void)setSelectedVeg:(id)sender
{
[selectedVegetableIcon setAlpha:0.0];
[UIView animateWithDuration:0.4
animations: ^{
float angle = [self spinnerAngleForVegetable:sender];
[vegetableSpinner setTransform:CGAffineTransformMakeRotation(angle)];
}
completion:^(BOOL finished) {
[selectedVegetableIcon setAlpha:1.0];
}];
}
以上代码来自WWDC2010 iPlant PlantCareViem.m
UIViewAnimation style Animation
- (void)setSelectedVeg:(id)sender
{
[selectedVegetableIcon setAlpha:0.0];
[UIView beginAnimations:@"setSelectedVeg" context:nil];
float angle = [self spinnerAngleForVegetable:sender];
[vegetableSpinner setTransform:CGAffineTransformMakeRotation(angle)];
[UIView setAnimationDuration:0.4];
[UIView setAnimationDelegate:self];
[UIView setAnimationDidStopSelector:@selector(done)];
[UIView commitAnimations];
}
-(void)done
{
[selectedVegetableIcon setAlpha:1.0];
}
]]>
2010-06-15 09:35:14.408 JoyPlayer[494:207] *** Terminating app due to uncaught exception 'NSInternalInconsistencyException', reason: 'Invalid update: invalid number of sections. The number of sections contained in the table view after the update (2) must be equal to the number of sections contained in the table view before the update (1), plus or minus the number of sections inserted or deleted (0 inserted, 0 deleted).'
2010-06-15 09:35:14.409 JoyPlayer[494:207] Stack: (
36209755,
2528503049,
36293691,
2776852,
5075846,
5020217,
43132,
387640,
2454948,
2454803,
32134584,
32132632,
32135830,
31795157,
35993825,
35990600,
41654157,
41654354,
4763651,
10756,
10610
)
]]>
BOOL canSendSMS = [MFMessageComposeViewController canSendText];
NSLog(@"can send SMS [%d]", canSendSMS);
if (canSendSMS) {
MFMessageComposeViewController *picker = [[MFMessageComposeViewController alloc] init];
picker.messageComposeDelegate = self;
picker.navigationBar.tintColor = [UIColor blackColor];
picker.body = @"test";
picker.recipients = [NSArray arrayWithObject:@"186-0123-0123"];
[self presentModalViewController:picker animated:YES];
[picker release];
}
}
- (void)messageComposeViewController:(MFMessageComposeViewController *)controller didFinishWithResult:(MessageComposeResult)result {
// Notifies users about errors associated with the interface
switch (result) {
case MessageComposeResultCancelled:
if (DEBUG) NSLog(@"Result: canceled");
break;
case MessageComposeResultSent:
if (DEBUG) NSLog(@"Result: Sent");
break;
case MessageComposeResultFailed:
if (DEBUG) NSLog(@"Result: Failed");
break;
default:
break;
}
[self dismissModalViewControllerAnimated:YES];
}
]]>@implementation UINavigationBar (UINavigationBarCategory)
- (void)drawRect:(CGRect)rect {
//加入旋转坐标系代码
// Drawing code
UIImage *navBarImage = [UIImage imageNamed:@"LOGO_320×44.png"];
CGContextRef context = UIGraphicsGetCurrentContext();
CGContextTranslateCTM(context, 0.0, self.frame.size.height);
CGContextScaleCTM(context, 1.0, -1.0);
CGPoint center=self.center;
CGImageRef cgImage= CGImageCreateWithImageInRect(navBarImage.CGImage, CGRectMake(0, 0, 1, 44));
CGContextDrawImage(context, CGRectMake(center.x-160-80, 0, 80, self.frame.size.height), cgImage);
CGContextDrawImage(context, CGRectMake(center.x-160, 0, 320, self.frame.size.height), navBarImage.CGImage);
CGContextDrawImage(context, CGRectMake(center.x+160, 0, 80, self.frame.size.height), cgImage);
}
@end
old code
CGContextDrawImage(context, CGRectMake(0, 0, self.frame.size.width, self.frame.size.height), navBarImage.CGImage);
- (void)configureView:(NSString *)performaction {
if ([performaction length] >0) {
SEL sel=sel_registerName([performaction UTF8String]);
if ([self respondsToSelector:sel]) {
[self performSelector:sel];
}
}
}
本文简要介绍如何使用KVO 跟踪NSOperation 状态
traceOperation 方法跟踪 PageLoadOperation（NSOperation 子类）
- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions {
// Override point for customization after app launch
for (NSString *urlString in urlArray)
{
NSURL *url = [NSURL URLWithString:urlString];
PageLoadOperation *plo = [[PageLoadOperation alloc] initWithURL:url];
[queue addOperation:plo];
[self traceOperation:plo];
[plo release];
}
[window addSubview:viewController.view];
[window makeKeyAndVisible];
return YES;
}
traceOperation 方法
The NSOperation class is key-value coding (KVC) and key-value observing (KVO) compliant for several of its properties. As needed, you can observe these properties to control other parts of your application. The properties you can observe include the following:
isCancelled - read-only property
isConcurrent - read-only property
isExecuting - read-only property
isFinished - read-only property
isReady - read-only property
dependencies - read-only property
queuePriority - readable and writable property
completionBlock - readable and writable property (Mac OS X only)
-(void)traceOperation:(NSOperation*)obj
{
[obj addObserver:self
forKeyPath:@"isExecuting"
options:0
context:NULL];
[obj addObserver:self
forKeyPath:@"isFinished"
options:0
context:NULL];
[obj addObserver:self
forKeyPath:@"isReady"
options:0
context:NULL];
[obj addObserver:self
forKeyPath:@"isCancelled"
options:0
context:NULL];
}
#pragma mark -
#pragma mark KVO 回调方法
- (void)observeValueForKeyPath:(NSString *)keyPath
ofObject:(id)object
change:(NSDictionary *)change
context:(void *)context
{
NSLog(@"dict= %@ obj= %@,keypath=%@",change,object,keyPath);
}
NSOperation 完成后回调方法,执行完第一个下载，cancel所有
- (void)pageLoaded:(NSString*)document;
{
NSLog(@"%s Do something with the XMLDocument", _cmd);
for (id opt in [queue operations]) {
NSLog(@"opt:%@ will cancel",opt);
[(NSOperation*)opt cancel];
}
}
执行log如下
[Session started at 2010-05-25 13:31:26 +0800.]
2010-05-25 13:31:28.030 AsyncDownloader[2672:4503] dict= {
kind = 1;
} obj= <PageLoadOperation: 0x3b0a530>,keypath=isExecuting
2010-05-25 13:31:28.032 AsyncDownloader[2672:4903] dict= {
kind = 1;
} obj= <PageLoadOperation: 0x390dc00>,keypath=isExecuting
2010-05-25 13:31:28.490 AsyncDownloader[2672:207] pageLoaded: Do something with the XMLDocument
2010-05-25 13:31:28.490 AsyncDownloader[2672:4903] dict= {
kind = 1;
} obj= <PageLoadOperation: 0x390dc00>,keypath=isExecuting
2010-05-25 13:31:28.490 AsyncDownloader[2672:207] opt:<PageLoadOperation: 0x3b0a530> will cancel
2010-05-25 13:31:28.494 AsyncDownloader[2672:207] dict= {
kind = 1;
} obj= <PageLoadOperation: 0x3b0a530>,keypath=isCancelled
2010-05-25 13:31:28.495 AsyncDownloader[2672:207] opt:<PageLoadOperation: 0x390dc00> will cancel
2010-05-25 13:31:28.495 AsyncDownloader[2672:4903] dict= {
kind = 1;
} obj= <PageLoadOperation: 0x390dc00>,keypath=isFinished
2010-05-25 13:31:28.495 AsyncDownloader[2672:6607] dict= {
kind = 1;
} obj= <PageLoadOperation: 0x3912ae0>,keypath=isExecuting
2010-05-25 13:31:28.496 AsyncDownloader[2672:207] opt:<PageLoadOperation: 0x3912ae0> will cancel
2010-05-25 13:31:28.496 AsyncDownloader[2672:207] dict= {
kind = 1;
} obj= <PageLoadOperation: 0x3912ae0>,keypath=isCancelled
2010-05-25 13:31:28.497 AsyncDownloader[2672:207] opt:<PageLoadOperation: 0x3913470> will cancel
2010-05-25 13:31:28.497 AsyncDownloader[2672:207] dict= {
kind = 1;
} obj= <PageLoadOperation: 0x3913470>,keypath=isCancelled
2010-05-25 13:31:28.498 AsyncDownloader[2672:207] opt:<PageLoadOperation: 0x39135f0> will cancel
2010-05-25 13:31:28.499 AsyncDownloader[2672:207] dict= {
kind = 1;
} obj= <PageLoadOperation: 0x39135f0>,keypath=isCancelled
2010-05-25 13:31:28.916 AsyncDownloader[2672:207] pageLoaded: Do something with the XMLDocument
2010-05-25 13:31:28.916 AsyncDownloader[2672:207] opt:<PageLoadOperation: 0x3b0a530> will cancel
2010-05-25 13:31:28.916 AsyncDownloader[2672:207] opt:<PageLoadOperation: 0x3912ae0> will cancel
2010-05-25 13:31:28.916 AsyncDownloader[2672:207] opt:<PageLoadOperation: 0x3913470> will cancel
2010-05-25 13:31:28.916 AsyncDownloader[2672:207] opt:<PageLoadOperation: 0x39135f0> will cancel
2010-05-25 13:31:28.916 AsyncDownloader[2672:4503] dict= {
kind = 1;
} obj= <PageLoadOperation: 0x3b0a530>,keypath=isExecuting
2010-05-25 13:31:28.918 AsyncDownloader[2672:4503] dict= {
kind = 1;
} obj= <PageLoadOperation: 0x3b0a530>,keypath=isFinished
2010-05-25 13:31:28.920 AsyncDownloader[2672:5a33] dict= {
kind = 1;
} obj= <PageLoadOperation: 0x3913470>,keypath=isFinished
2010-05-25 13:31:28.922 AsyncDownloader[2672:4507] dict= {
kind = 1;
} obj= <PageLoadOperation: 0x39135f0>,keypath=isFinished
2010-05-25 13:31:30.652 AsyncDownloader[2672:6607] dict= {
kind = 1;
} obj= <PageLoadOperation: 0x3912ae0>,keypath=isExecuting
2010-05-25 13:31:30.652 AsyncDownloader[2672:207] pageLoaded: Do something with the XMLDocument
2010-05-25 13:31:30.653 AsyncDownloader[2672:207] opt:<PageLoadOperation: 0x3912ae0> will cancel
2010-05-25 13:31:30.654 AsyncDownloader[2672:6607] dict= {
kind = 1;
} obj= <PageLoadOperation: 0x3912ae0>,keypath=isFinished
测试项目代码下载 AsyncDownloader.zip
//
// Greeting.h 头文件
// cpp_demo
//
// Created by 孔祥波 on 10-5-24.
// Copyright 2010 aaa. All rights reserved.
//
#import <Foundation/Foundation.h>
class Hello {
private:
id greeting_text; // holds an NSString
public:
Hello() {
greeting_text = @"Hello, world!";
}
Hello(const char* initial_greeting_text) {
greeting_text = [[NSString alloc] initWithUTF8String:initial_greeting_text];
}
void say_hello() {
printf("%s\n", [greeting_text UTF8String]);
}
};
@interface Greeting : NSObject {
@private
Hello *hello;
}
- (id)init;
- (void)dealloc;
- (void)sayGreeting;
- (void)sayGreeting:(Hello*)greeting;
@end
//
// Greeting.mm
// cpp_demo
//
// Created by 孔祥波 on 10-5-24.
// Copyright 2010 aaa. All rights reserved.
//
#import "Greeting.h"
@implementation Greeting
- (id)init {
if (self = [super init]) {
hello = new Hello();
}
return self;
}
- (void)dealloc {
delete hello;
[super dealloc];
}
- (void)sayGreeting {
hello->say_hello();
}
- (void)sayGreeting:(Hello*)greeting {
greeting->say_hello();
}
@end
使用Greeting 类，主要使用的类命名必须以.mm结尾，否则无法编译。
#import "Greeting.h" 引入定义
Greeting *greeting = [[Greeting alloc] init];
[greeting sayGreeting]; // > Hello, world!
Hello *hello = new Hello("Bonjour, monde!");
[greeting sayGreeting:hello]; // > Bonjour, monde!
delete hello;
[greeting release];
例子下载 cpp_demo.zip
-(void)vgadisplay
{
NSLog(@"Number of screens: %d", [[UIScreen screens] count]);
if([[UIScreen screens]count] > 1) //if there are more than 1 screens connected to the device
{
CGSize max;
UIScreenMode *maxScreenMode;
for(int i = 0; i < [[[[UIScreen screens] objectAtIndex:1] availableModes]count]; i++)
{
UIScreenMode *current = [[[[UIScreen screens]objectAtIndex:1]availableModes]objectAtIndex:i];
if(current.size.width > max.width);
{
max = current.size;
maxScreenMode = current;
}
}
//Now we have the highest mode. Turn the external display to use that mode.
UIScreen *external = [[UIScreen screens] objectAtIndex:1];
external.currentMode = maxScreenMode;
UIWindow *newwindow = [[UIWindow alloc] initWithFrame:[external applicationFrame]];
UIView *aview=[[UIView alloc] initWithFrame:[external applicationFrame]];
aview.backgroundColor =[UIColor redColor];
[newwindow addSubview:aview];
newwindow.screen = external;
[newwindow makeKeyAndVisible];
}
}