iOS放大镜例子，用View类实现

之前传过一个用window类实现的，但在实际项目中用多个window会出现一些不必要的冲突。所以用View重新实现一个。

例子：http://download.csdn.net/detail/qqmcy/7025253

ViewController.h

//
//  ViewController.h
//  放大镜例子
//
//  Created by 杜甲 on 14-3-10.
//  Copyright (c) 2014年 杜甲. All rights reserved.
//

#import <UIKit/UIKit.h>
#import "MagnifierV.h"

@interface ViewController : UIViewController
@property (strong , nonatomic) MagnifierV* magnifier;

@end

//
//  ViewController.m
//  放大镜例子
//
//  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];
    
    
    /*要将放大镜视图最后 addSubview 到视图中*/
    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

iOS放大镜例子，用View类实现,布布扣,bubuko.com

iOS放大镜例子，用View类实现

原文：http://blog.csdn.net/qqmcy/article/details/21037731