iPhone 3.0 SDK开发秘籍笔记（第六章）

6.5 使用标记查找视图

扩展UIView行为，自动转换viewWithtag。

UIView-TagExtensions.h

/*
 Erica Sadun, http://ericasadun.com
 iPhone Developer's Cookbook, 3.0 Edition
 BSD License, Use at your own risk
 */

#import <UIKit/UIKit.h>
#ifdef _USE_OS_3_OR_LATER
#import <MapKit/MapKit.h>
#endif

@interface UIView (TagExtensions)
- (UIAlertView *) alertViewWithTag: (NSInteger) aTag;
- (UIActionSheet *) actionSheetWithTag: (NSInteger) aTag;
- (UITableView *) tableViewWithTag: (NSInteger) aTag;
- (UITableViewCell *) tableViewCellWithTag: (NSInteger) aTag;
- (UIImageView *) imageViewWithTag: (NSInteger) aTag;
- (UIWebView *) webViewWithTag: (NSInteger) aTag;
- (UITextView *) textViewWithTag: (NSInteger) aTag;
- (UIScrollView *) scrollViewWithTag: (NSInteger) aTag;
- (UIPickerView *) pickerViewWithTag: (NSInteger) aTag;
- (UIDatePicker *) datePickerWithTag: (NSInteger) aTag;
- (UISegmentedControl *) segmentedControlWithTag: (NSInteger) aTag;
- (UILabel *) labelWithTag: (NSInteger) aTag;
- (UIButton *) buttonWithTag: (NSInteger) aTag;
- (UITextField *) textFieldWithTag: (NSInteger) aTag;
- (UISwitch *) switchWithTag: (NSInteger) aTag;
- (UISlider *) sliderWithTag: (NSInteger) aTag;
- (UIProgressView *) progressViewWithTag: (NSInteger) aTag;
- (UIActivityIndicatorView *) activityIndicatorViewWithTag: (NSInteger) aTag;
- (UIPageControl *) pageControlWithTag: (NSInteger) aTag;
- (UIWindow *) windowWithTag: (NSInteger) aTag;
- (UISearchBar *) searchBarWithTag: (NSInteger) aTag;
- (UINavigationBar *) navigationBarWithTag: (NSInteger) aTag;
- (UIToolbar *) toolbarWithTag: (NSInteger) aTag;
- (UITabBar *) tabBarWithTag: (NSInteger) aTag;
#ifdef _USE_OS_3_OR_LATER
- (MKMapView *) mapViewWithTag: (NSInteger) aTag;
#endif
@end

UIView-TagExtensions.m

/*
 Erica Sadun, http://ericasadun.com
 iPhone Developer's Cookbook, 3.0 Edition
 BSD License, Use at your own risk
 */

#import "UIView-TagExtensions.h"

@implementation UIView (TagExtensions)
- (UIAlertView *) alertViewWithTag: (NSInteger) aTag
{
	return (UIAlertView *)[self viewWithTag:aTag];
}

- (UIActionSheet *) actionSheetWithTag: (NSInteger) aTag
{
	return (UIActionSheet *)[self viewWithTag:aTag];
}

- (UITableView *) tableViewWithTag: (NSInteger) aTag
{
	return (UITableView *)[self viewWithTag:aTag];
}

- (UITableViewCell *) tableViewCellWithTag: (NSInteger) aTag
{
	return (UITableViewCell *)[self viewWithTag:aTag];
}

- (UIImageView *) imageViewWithTag: (NSInteger) aTag
{
	return (UIImageView *)[self viewWithTag:aTag];
}

- (UIWebView *) webViewWithTag: (NSInteger) aTag
{
	return (UIWebView *)[self viewWithTag:aTag];
}

- (UITextView *) textViewWithTag: (NSInteger) aTag
{
	return (UITextView *)[self viewWithTag:aTag];
}

- (UIScrollView *) scrollViewWithTag: (NSInteger) aTag
{
	return (UIScrollView *)[self viewWithTag:aTag];
}

- (UIPickerView *) pickerViewWithTag: (NSInteger) aTag
{
	return (UIPickerView *)[self viewWithTag:aTag];
}

- (UIDatePicker *) datePickerWithTag: (NSInteger) aTag
{
	return (UIDatePicker *)[self viewWithTag:aTag];
}

- (UISegmentedControl *) segmentedControlWithTag: (NSInteger) aTag
{
	return (UISegmentedControl *)[self viewWithTag:aTag];
}

- (UILabel *) labelWithTag: (NSInteger) aTag
{
	return (UILabel *)[self viewWithTag:aTag];
}

- (UIButton *) buttonWithTag: (NSInteger) aTag
{
	return (UIButton *)[self viewWithTag:aTag];
}

- (UITextField *) textFieldWithTag: (NSInteger) aTag
{
	return (UITextField *)[self viewWithTag:aTag];
}

- (UISwitch *) switchWithTag: (NSInteger) aTag
{
	return (UISwitch *)[self viewWithTag:aTag];
}

- (UISlider *) sliderWithTag: (NSInteger) aTag
{
	return (UISlider *)[self viewWithTag:aTag];
}

- (UIProgressView *) progressViewWithTag: (NSInteger) aTag
{
	return (UIProgressView *)[self viewWithTag:aTag];
}

- (UIActivityIndicatorView *) activityIndicatorViewWithTag: (NSInteger) aTag
{
	return (UIActivityIndicatorView *)[self viewWithTag:aTag];
}

- (UIPageControl *) pageControlWithTag: (NSInteger) aTag
{
	return (UIPageControl *)[self viewWithTag:aTag];
}

- (UIWindow *) windowWithTag: (NSInteger) aTag
{
	return (UIWindow *)[self viewWithTag:aTag];
}

- (UISearchBar *) searchBarWithTag: (NSInteger) aTag
{
	return (UISearchBar *)[self viewWithTag:aTag];
}

- (UINavigationBar *) navigationBarWithTag: (NSInteger) aTag
{
	return (UINavigationBar *)[self viewWithTag:aTag];
}

- (UIToolbar *) toolbarWithTag: (NSInteger) aTag
{
	return (UIToolbar *)[self viewWithTag:aTag];
}

- (UITabBar *) tabBarWithTag: (NSInteger) aTag
{
	return (UITabBar *)[self viewWithTag:aTag];
}

#ifdef _USE_OS_3_OR_LATER
- (MKMapView *) mapViewWithTag: (NSInteger) aTag
{
	return (MKMapView *)[self viewWithTag:aTag];
}
#endif
@end

6.6 命名视图

扩展UIView行为，自动转换viewWithtag根据名字。

UIView-NameExtensions.h

/*
 Erica Sadun, http://ericasadun.com
 iPhone Developer's Cookbook, 3.0 Edition
 BSD License, Use at your own risk
 */

#import <UIKit/UIKit.h>
#ifdef _USE_OS_3_OR_LATER
#import <MapKit/MapKit.h>
#endif

@interface UIView (NameExtensions)
- (NSInteger) registerName: (NSString *) aName;
- (BOOL) unregisterName: (NSString *) aName;

- (UIView *) viewNamed: (NSString *) aName;
- (UIAlertView *) alertViewNamed: (NSString *) aName;
- (UIActionSheet *) actionSheetNamed: (NSString *) aName;
- (UITableView *) tableViewNamed: (NSString *) aName;
- (UITableViewCell *) tableViewCellNamed: (NSString *) aName;
- (UIImageView *) imageViewNamed: (NSString *) aName;
- (UIWebView *) webViewNamed: (NSString *) aName;
- (UITextView *) textViewNamed: (NSString *) aName;
- (UIScrollView *) scrollViewNamed: (NSString *) aName;
- (UIPickerView *) pickerViewNamed: (NSString *) aName;
- (UIDatePicker *) datePickerNamed: (NSString *) aName;
- (UISegmentedControl *) segmentedControlNamed: (NSString *) aName;
- (UILabel *) labelNamed: (NSString *) aName;
- (UIButton *) buttonNamed: (NSString *) aName;
- (UITextField *) textFieldNamed: (NSString *) aName;
- (UISwitch *) switchNamed: (NSString *) aName;
- (UISlider *) sliderNamed: (NSString *) aName;
- (UIProgressView *) progressViewNamed: (NSString *) aName;
- (UIActivityIndicatorView *) activityIndicatorViewNamed: (NSString *) aName;
- (UIPageControl *) pageControlNamed: (NSString *) aName;
- (UIWindow *) windowNamed: (NSString *) aName;
- (UISearchBar *) searchBarNamed: (NSString *) aName;
- (UINavigationBar *) navigationBarNamed: (NSString *) aName;
- (UIToolbar *) toolbarNamed: (NSString *) aName;
- (UITabBar *) tabBarNamed: (NSString *) aName;
#ifdef _USE_OS_3_OR_LATER
- (MKMapView *) mapViewNamed: (NSString *) aName;
#endif
@end

UIView-NameExtensions.m

/*
 Erica Sadun, http://ericasadun.com
 iPhone Developer's Cookbook, 3.0 Edition
 BSD License, Use at your own risk
 */

#import "UIView-NameExtensions.h"

@interface ViewIndexer : NSObject {
	NSMutableDictionary *tagdict;
	NSInteger count;
}
@property (nonatomic, retain) NSMutableDictionary *tagdict;
@end

@implementation ViewIndexer
@synthesize tagdict;

#pragma mark sharedInstance
static ViewIndexer *sharedInstance = nil;

+(ViewIndexer *) sharedInstance {
    if(!sharedInstance) sharedInstance = [[self alloc] init];
    return sharedInstance;
}

- (id) init
{
	if (!(self = [super init])) return self;
	self.tagdict = [NSMutableDictionary dictionary];
	count = 10000;
	return self;
}

- (void) dealloc
{
	self.tagdict = nil;
	[super dealloc];
}

#pragma mark registration
// Pull a new number and increase the count
- (NSInteger) pullNumber
{
	return count++;
}

// Check to see if name exists in dictionary
- (BOOL) nameExists: (NSString *) aName
{
	return [self.tagdict objectForKey:aName] != nil;
}

// Pull out first matching name for tag
- (NSString *) nameForTag: (NSInteger) aTag
{
	NSNumber *tag = [NSNumber numberWithInt:aTag];
	NSArray *names = [self.tagdict allKeysForObject:tag];
	if (!names) return nil;
	if ([names count] == 0) return nil;
	return [names objectAtIndex:0];
}

// Return the tag for a registered name. 0 if not found
- (NSInteger) tagForName: (NSString *)aName
{
	NSNumber *tag = [self.tagdict objectForKey:aName];
	if (!tag) return 0;
	return [tag intValue];
}

// Unregistering reverts tag to 0
- (BOOL) unregisterName: (NSString *) aName forView: (UIView *) aView
{
	NSNumber *tag = [self.tagdict objectForKey:aName];
	
	// tag not found
	if (!tag) return NO;
	
	// tag does not match registered name
	if (aView.tag != [tag intValue]) return NO;
	
	aView.tag = 0;
	[self.tagdict removeObjectForKey:aName];
	return YES;
}

// Register a new name. Names will not re-register (unregister first, please).
// If a view is already registered, it is unregistered and re-registered
- (NSInteger) registerName:(NSString *)aName forView: (UIView *) aView
{
	// You cannot re-register an existing name
	if ([[ViewIndexer sharedInstance] nameExists:aName]) return 0;
	
	// Check to see if the view is named already. If so, unregister.
	NSString *currentName = [self nameForTag:aView.tag];
	if (currentName) [self unregisterName:currentName forView:aView];
	
	// Register the existing tag or pull a new tag if aView.tag is 0
	if (!aView.tag) aView.tag = [[ViewIndexer sharedInstance] pullNumber];
	[self.tagdict setObject:[NSNumber numberWithInt:aView.tag] forKey:aName];
	return aView.tag;
}
@end

@implementation UIView (NameExtensions)

#pragma mark Registration
- (NSInteger) registerName: (NSString *) aName
{
	return [[ViewIndexer sharedInstance] registerName:aName forView:self];
}

- (BOOL) unregisterName: (NSString *) aName
{
	return [[ViewIndexer sharedInstance] unregisterName:aName forView:self];
}

#pragma mark Typed Name Retrieval
- (UIView *) viewNamed: (NSString *) aName
{
	NSInteger tag = [[ViewIndexer sharedInstance] tagForName:aName];
	return [self viewWithTag:tag];
}

- (UIAlertView *) alertViewNamed: (NSString *) aName
{
	return (UIAlertView *)[self viewNamed:aName];
}

- (UIActionSheet *) actionSheetNamed: (NSString *) aName
{
	return (UIActionSheet *)[self viewNamed:aName];
}

- (UITableView *) tableViewNamed: (NSString *) aName
{
	return (UITableView *)[self viewNamed:aName];
}

- (UITableViewCell *) tableViewCellNamed: (NSString *) aName
{
	return (UITableViewCell *)[self viewNamed:aName];
}

- (UIImageView *) imageViewNamed: (NSString *) aName
{
	return (UIImageView *)[self viewNamed:aName];
}

- (UIWebView *) webViewNamed: (NSString *) aName
{
	return (UIWebView *)[self viewNamed:aName];
}

- (UITextView *) textViewNamed: (NSString *) aName
{
	return (UITextView *)[self viewNamed:aName];
}

- (UIScrollView *) scrollViewNamed: (NSString *) aName
{
	return (UIScrollView *)[self viewNamed:aName];
}

- (UIPickerView *) pickerViewNamed: (NSString *) aName
{
	return (UIPickerView *)[self viewNamed:aName];
}

- (UIDatePicker *) datePickerNamed: (NSString *) aName
{
	return (UIDatePicker *)[self viewNamed:aName];
}

- (UISegmentedControl *) segmentedControlNamed: (NSString *) aName
{
	return (UISegmentedControl *)[self viewNamed:aName];
}

- (UILabel *) labelNamed: (NSString *) aName
{
	return (UILabel *)[self viewNamed:aName];
}

- (UIButton *) buttonNamed: (NSString *) aName
{
	return (UIButton *)[self viewNamed:aName];
}

- (UITextField *) textFieldNamed: (NSString *) aName
{
	return (UITextField *)[self viewNamed:aName];
}

- (UISwitch *) switchNamed: (NSString *) aName
{
	return (UISwitch *)[self viewNamed:aName];
}

- (UISlider *) sliderNamed: (NSString *) aName
{
	return (UISlider *)[self viewNamed:aName];
}

- (UIProgressView *) progressViewNamed: (NSString *) aName
{
	return (UIProgressView *)[self viewNamed:aName];
}

- (UIActivityIndicatorView *) activityIndicatorViewNamed: (NSString *) aName
{
	return (UIActivityIndicatorView *)[self viewNamed:aName];
}

- (UIPageControl *) pageControlNamed: (NSString *) aName
{
	return (UIPageControl *)[self viewNamed:aName];
}

- (UIWindow *) windowNamed: (NSString *) aName
{
	return (UIWindow *)[self viewNamed:aName];
}

- (UISearchBar *) searchBarNamed: (NSString *) aName
{
	return (UISearchBar *)[self viewNamed:aName];
}

- (UINavigationBar *) navigationBarNamed: (NSString *) aName
{
	return (UINavigationBar *)[self viewNamed:aName];
}

- (UIToolbar *) toolbarNamed: (NSString *) aName
{
	return (UIToolbar *)[self viewNamed:aName];
}

- (UITabBar *) tabBarNamed: (NSString *) aName
{
	return (UITabBar *)[self viewNamed:aName];
}

#ifdef _USE_OS_3_OR_LATER
- (MKMapView *) mapViewNamed: (NSString *) aName
{
	return (MKMapView *)[self viewNamed:aName];
}
#endif
@end

6.19 当视图显示时反弹视图

扩展UIView行为，使得动画可以连续播放。

UIView-ModalAnimationHelper.h


/*
 Erica Sadun, http://ericasadun.com
 iPhone Developer's Cookbook, 3.0 Edition
 BSD License, Use at your own risk
 */

#import <UIKit/UIKit.h>

@interface UIView (ModalAnimationHelper)
+ (void) commitModalAnimations;
@end

UIView-ModalAnimationHelper.m


/*
 Erica Sadun, http://ericasadun.com
 iPhone Developer's Cookbook, 3.0 Edition
 BSD License, Use at your own risk

 Runloop credit to Kenny TM. Mistakes are mine. 
 */

#import "UIView-ModalAnimationHelper.h"

@interface UIViewDelegate : NSObject
{
	CFRunLoopRef currentLoop;
}
@end

@implementation UIViewDelegate
-(id) initWithRunLoop: (CFRunLoopRef)runLoop 
{
	if (self = [super init]) currentLoop = runLoop;
	return self;
}

-(void) animationFinished: (id) sender
{
	CFRunLoopStop(currentLoop);
}
@end

@implementation UIView (ModalAnimationHelper)
+ (void) commitModalAnimations
{
	CFRunLoopRef currentLoop = CFRunLoopGetCurrent();
	
	UIViewDelegate *uivdelegate = [[UIViewDelegate alloc] initWithRunLoop:currentLoop];
	[UIView setAnimationDelegate:uivdelegate];
	[UIView setAnimationDidStopSelector:@selector(animationFinished:)];
	[UIView commitAnimations];
	CFRunLoopRun();
	[uivdelegate release];
}
@end

main.m


/*
 Erica Sadun, http://ericasadun.com
 iPhone Developer's Cookbook, 3.0 Edition
 BSD License, Use at your own risk
 */

#import <UIKit/UIKit.h>
#import "UIView-ModalAnimationHelper.h"

#define COOKBOOK_PURPLE_COLOR	[UIColor colorWithRed:0.20392f green:0.19607f blue:0.61176f alpha:1.0f]
#define BARBUTTON(TITLE, SELECTOR) 	[[[UIBarButtonItem alloc] initWithTitle:TITLE style:UIBarButtonItemStylePlain target:self action:SELECTOR] autorelease]

@interface TestBedViewController : UIViewController
{
	int direction;
}
@end

@implementation TestBedViewController

- (void) animate: (id) sender
{
	// Hide the bar button and show the view
	self.navigationItem.rightBarButtonItem = nil;
	[self.view viewWithTag:101].alpha = 1.0f;
	
	// Bounce to 115% of the normal size
	[UIView beginAnimations:nil context:UIGraphicsGetCurrentContext()];
	[UIView setAnimationCurve:UIViewAnimationCurveEaseInOut];
	[UIView setAnimationDuration:0.4f];
	[self.view viewWithTag:101].transform = CGAffineTransformMakeScale(1.15f, 1.15f);
	[UIView commitModalAnimations];

	// Return back to 100%
	[UIView beginAnimations:nil context:UIGraphicsGetCurrentContext()];
	[UIView setAnimationCurve:UIViewAnimationCurveEaseInOut];
	[UIView setAnimationDuration:0.3f];
	[self.view viewWithTag:101].transform = CGAffineTransformMakeScale(1.0f, 1.0f);
	[UIView commitModalAnimations];
	
	// Pause for a second and appreciate the presentation
	[NSThread sleepUntilDate:[NSDate dateWithTimeIntervalSinceNow:1.0f]];
	
	// Slowly zoom back down and hide the view
	[UIView beginAnimations:nil context:UIGraphicsGetCurrentContext()];
	[UIView setAnimationCurve:UIViewAnimationCurveEaseInOut];
	[UIView setAnimationDuration:1.0f];
	[self.view viewWithTag:101].transform = CGAffineTransformMakeScale(0.01f, 0.01f);
	[UIView commitModalAnimations];
	
	// Restore the bar button
	[self.view viewWithTag:101].alpha = 0.0f;
	self.navigationItem.rightBarButtonItem = BARBUTTON(@"Bounce", @selector(animate:));
}

- (void) viewDidLoad
{
	direction = 0;
	self.navigationController.navigationBar.tintColor = COOKBOOK_PURPLE_COLOR;
	self.navigationItem.rightBarButtonItem = BARBUTTON(@"Bounce", @selector(animate:));
	[self.view viewWithTag:101].transform = CGAffineTransformMakeScale(0.01f, 0.01f);
	[self.view viewWithTag:101].alpha = 0.0f;
}
@end

@interface TestBedAppDelegate : NSObject <UIApplicationDelegate>
@end

@implementation TestBedAppDelegate
- (void)applicationDidFinishLaunching:(UIApplication *)application {	
	UIWindow *window = [[UIWindow alloc] initWithFrame:[[UIScreen mainScreen] bounds]];
	UINavigationController *nav = [[UINavigationController alloc] initWithRootViewController:[[TestBedViewController alloc] init]];
	[window addSubview:nav.view];
	[window makeKeyAndVisible];
}
@end

int main(int argc, char *argv[])
{
	NSAutoreleasePool * pool = [[NSAutoreleasePool alloc] init];
	int retVal = UIApplicationMain(argc, argv, nil, @"TestBedAppDelegate");
	[pool release];
	return retVal;
}