iOS 开发总结(8)

来源：未知责任编辑：责任编辑发表时间:2013-12-01 14:19　点击:次

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CGPoint pt = [[touches anyObject] locationInView:self];

startLocation = pt;

[[self superview] bringSubviewToFront:self];

}

- (void) touchesMoved:(NSSet*)touches withEvent:(UIEvent*)event

{

// Move relative to the original touch point 相对以前的触摸点进行移动

CGPoint pt = [[touches anyObject] locationInView:self];

CGRect frame = [self frame];

frame.origin.x += pt.x - startLocation.x;

frame.origin.y += pt.y - startLocation.y;

[self setFrame:frame];

}

3. Now instantiate the new class as you would any other new image and add it to your view

//实例这个新的类,放到你需要新的图片放到你的视图上

dragger = [[myDraggableImage alloc] initWithFrame:myDragRect];

[dragger setImage:[UIImage imageNamed:@"myImage.png"]];

[dragger setUserInteractionEnabled:YES];

线程:

1. Create the new thread:

[NSThread detachNewThreadSelector:@selector(myMethod) toTarget:self withObject:nil];

2. Create the method that is called by the new thread:

- (void)myMethod

{

NSAutoreleasePool *pool = [[NSAutoreleasePool alloc] init];

*** code that should be run in the new thread goes here ***

[pool release];

}

//What if you need to do something to the main thread from inside your new thread (for example, show a loading //symbol)? Use performSelectorOnMainThread.

[self performSelectorOnMainThread:@selector(myMethod) withObject:nil waitUntilDone:false];

Plist files

Application-specific plist files can be stored in the Resources folder of the app bundle. When the app first launches, it should check if there is an existing plist in the user's Documents folder, and if not it should copy the plist from the app bundle.

// Look in Documents for an existing plist file

NSArray *paths = NSSearchPathForDirectoriesInDomains( NSDocumentDirectory, NSUserDomainMask, YES);

NSString *documentsDirectory = [paths objectAtIndex:0];

myPlistPath = [documentsDirectory stringByAppendingPathComponent:

[NSString stringWithFormat: @"%@.plist", plistName] ];

[myPlistPath retain];

// If it's not there, copy it from the bundle

NSFileManager *fileManger = [NSFileManager defaultManager];

if ( ![fileManger fileExistsAtPath:myPlistPath] )

{

NSString *pathToSettingsInBundle = [[NSBundle mainBundle] pathForResource:plistName ofType:@"plist"];

}