ipod touch 破解方法

1. download redsn0w-mac_0.8

2. run redsnow

3. choose iPod2,1_3.0_7A341_Restore.ipsw

4. plugin ipod , close ipod

5. let iphone enter DFU mode ( 按住home & 電源 10秒 ，接著按home for some time)

6. if the screen show "waiting for reboot", unplug ipod & plug ipod again

UIViewController

originally in view of A controller,

then show view of B controller:

[self presentModalViewController:testViewController animated:YES];

[testViewController release];

jump back to view of A controller

[self dismissModelViewControllerAnimated:YES];

UIButton

ex:

UIButton *backButton = [UIButton buttonWithType:UIButtonTypeRoundedRect];

backButton.frame = CGRectMake(380, 260, 80, 30);

[backButton setTitle:@"Back" forState:UIControlStateNormal];

[backButton addTarget:self action:@selector(backButtonClicked:)

forControlEvents:UIControlEventTouchUpInside];

core animation

three basic steps for core animation:

1. beginAnimations

2. setAnimationDuration

3. commitAnimations

shorter word to access app delegate

#define AppDelegate (MyAppDelegate *)[[UIApplication sharedApplication] delegate]

then use AppDelegate in the code

do something in the future

1. execute function in the future

- (void)performSelector:(SEL)aSelector withObject:(id)anArgument afterDelay:(NSTimeInterval)delay;

ex: [self performSelector:@selector(sing:) withObject:nil afterDelay:1.4];

2. use timer

(NSTimer *)timerWithTimeInterval:(NSTimeInterval)ti target:(id)aTarget selector:(SEL)aSelector userInfo:(id)userInfo repeats:(BOOL)yesOrNo;

ex: [NSTimer scheduledTimerWithTimeInterval:1.0 target:self selector:@selector(test:) userInfo:nil repeats:YES];

note:

to delete timer, use invalidate method

ex:

-(void)test:(NSTimer*)timer

{

[timer invalidate];

}

iphone view size

UIInterfaceOrientationLandscapeLeft:

w:480 h:320