Простое введение в компонентно-ориентированное программирование под iPhone

MainController.h

@class SCViewSlider;
@interface MainController : UIViewController {

@private
	SCViewSlider *_viewSlider;
}

@property (nonatomic, retain) IBOutlet SCViewSlider *viewSlider;

@end

MainController.m

@implementation MainController

@synthesize viewSlider = _viewSlider;

- (void)viewDidLoad {
	
    [super viewDidLoad];
    
    self.viewSlider.hideKeyboardOnReturn = YES;
    self.viewSlider.ySlideDistance = 70.0f;
}

- (void)dealloc {

    [_viewSlider release];
    [super dealloc];
}

@end

SCViewSlider.h

#import <Foundation/Foundation.h>

typedef enum {
	SCSlideDirectionUp,
	SCSlideDirectionDown
} SCSlideDirection;

@interface SCViewSlider : NSObject<UITextFieldDelegate> {

@private
	UIView *_viewToSlide;
	CGFloat _ySlideDistance;
	CGFloat _heightSlideDistance;
	CGFloat _slideDuration;
	BOOL _hideKeyboardOnReturn;
}

@property (nonatomic, retain) IBOutlet UIView *viewToSlide;
@property (nonatomic, assign) CGFloat ySlideDistance;
@property (nonatomic, assign) CGFloat heightSlideDistance;
@property (nonatomic, assign) CGFloat slideDuration;
@property (nonatomic, assign) BOOL hideKeyboardOnReturn;

@end

SCViewSlider.m

#import "SCViewSlider.h"

@interface SCViewSlider (/* Private methods */)

- (void)slideTableView:(SCSlideDirection)direction;

@end

@implementation SCViewSlider

@synthesize viewToSlide = _viewToSlide;
@synthesize ySlideDistance = _ySlideDistance, heightSlideDistance = _heightSlideDistance, slideDuration = _slideDuration;
@synthesize hideKeyboardOnReturn = _hideKeyboardOnReturn;

- (id)init {

	if (self = [super init]) {
		_slideDuration = 0.3f;
	}
	return self;
}

- (void)dealloc {

	[_viewToSlide release];
	[super dealloc];
}

#pragma mark TextField Callbacks

- (void)textFieldDidBeginEditing:(UITextField *)textField {
	
	[self slideTableView:SCSlideDirectionUp];
}

- (void)textFieldDidEndEditing:(UITextField *)textField {
	
	[self slideTableView:SCSlideDirectionDown];
}

- (BOOL)textFieldShouldReturn:(UITextField *)textField {

	if (self.hideKeyboardOnReturn) {
		[textField resignFirstResponder];
	}
	
	return YES;
}

- (void)slideTableView:(C7SlideDirection)direction {
	
	CGFloat y = SCSlideDirectionUp == direction ? -self.ySlideDistance : self.ySlideDistance;
	CGFloat height = SCSlideDirectionUp == direction ? -self.heightSlideDistance : self.heightSlideDistance;
	
	CGRect rect = self.viewToSlide.frame;
	rect = CGRectMake(rect.origin.x, rect.origin.y + y, rect.size.width, rect.size.height + height);
	
	[UIView beginAnimations:@"SCViewSlider::slideView" context:nil];
	[UIView setAnimationBeginsFromCurrentState:YES];
	[UIView setAnimationDuration:self.slideDuration];
	
	self.viewToSlide.frame = rect;

	[UIView commitAnimations];
}

@end