iOS放大鏡例子，用View類實現

 

ViewController.h

 

////  ViewController.h//  放大鏡例子////  Created by 杜甲 on 14-3-10.//  Copyright (c) 2014年 杜甲. All rights reserved.//#import #import MagnifierV.h@interface ViewController : UIViewController@property (strong , nonatomic) MagnifierV* magnifier;@end

ViewController.m

 

 

////  ViewController.m//  放大鏡例子////  Created by 杜甲 on 14-3-10.//  Copyright (c) 2014年 杜甲. All rights reserved.//#import ViewController.h@interface ViewController ()@end@implementation ViewController- (void)viewDidLoad{    [super viewDidLoad];// Do any additional setup after loading the view, typically from a nib.        UIImageView* image = [[UIImageView alloc] initWithImage:[UIImage imageNamed:@changmen.jpg]];    image.frame  = CGRectMake(0, 0, 320, 548);    [self.view addSubview:image];            /*要將放大鏡視圖最後 addSubview 到視圖中*/    self.magnifier = [[MagnifierV alloc] initWithFrame:CGRectMake(0, 0, 80, 80)];    self.magnifier.viewToMagnify = self.view;    [self.view addSubview:self.magnifier];        self.magnifier.hidden = YES;}- (void)touchesBegan:(NSSet *)touches withEvent:(UIEvent *)event {        self.magnifier.hidden = NO;        UITouch* touch = [touches anyObject];    CGPoint point = [touch locationInView:self.view];    self.magnifier.touchPoint = point;    [self.magnifier setNeedsDisplay];    }- (void)touchesMoved:(NSSet *)touches withEvent:(UIEvent *)event {[self handleAction:touches];}- (void)touchesEnded:(NSSet *)touches withEvent:(UIEvent *)event {self.magnifier.hidden = YES;}- (void)handleAction:(id)timerObj {NSSet *touches = timerObj;UITouch *touch = [touches anyObject];       CGPoint point =[touch locationInView:self.view];    self.magnifier.touchPoint = point;[self.magnifier setNeedsDisplay];}- (void)didReceiveMemoryWarning{    [super didReceiveMemoryWarning];    // Dispose of any resources that can be recreated.}@end