카테고리 사용법

UIViewControll+OverlayView.h

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#import <UIKit/UIKit.h>   @interface UIViewController (OverlayView)   -(void)showLayer:(NSString *)message; -(void)hideLayer; @end

UIViewController+OverlayView.m

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#import "UIViewController+OverlayView.h"   @implementation UIViewController (OverlayView)   -(void)showLayer:(NSString *)message {     UIView *layer = [[UIView alloc] initWithFrame:self.view.bounds];     // layer.alpha = 0.5;     layer.backgroundColor = [[UIColor clearColor] colorWithAlphaComponent:0.5];           /* Create Label */     UILabel *label = [[UILabel alloc] initWithFrame:self.view.bounds];     label.textAlignment = UITextAlignmentCenter;     label.lineBreakMode = YES; // 개행 설정.     label.numberOfLines = 0; // 개행 숫자에 제한을 두지 않음.     label.backgroundColor = [UIColor clearColor];     label.textColor = [UIColor whiteColor];     label.text = message;     [layer addSubview:label];     [label release];           /* Add LayerView */     [self.view addSubview:layer];     [layer release]; }   -(void)hideLayer {     NSArray *subViews = [self.view subviews];     UIView *layer = [subViews lastObject];     [layer removeFromSuperview]; } @end

※ alpha 를 적용하게되면, UIView *layer 에 올라오는 컨트롤 및 서브뷰들도 해당 alpha value 가 적용되어 보여진다. 반면, backgroundColor 는 해당 View 에만 alpha value 가 적용된다.

USING CATEGORY

ViewController.m

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#import "ViewController.h" #import "UIViewController+OverlayView.h"   @implementation ViewController - (IBAction)onBtnAction:(id)sender {     [self showLayer:@"MESSAGE TO SHOW"];           [self performSelector:@selector(onHideLayer) withObject:nil afterDelay:2.0f]; }   - (void)onHideLayer {     [self hideLayer]; } @end

- See more at: http://metalkin.tistory.com/47#sthash.iVctJirU.dpuf