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1.iOS -

推送

openssl

合并

//1.1 生成 opensslkeyopenssl pkcs12 -nocerts -out PushKey.pem -in apns-dev-cert.p12//1.2 输入以上成功之后会出现以下这段：Enter PEM pass phrase：输入密码//2.导出 pemopenssl pkcs12 -clcerts -nokeys -out apns-dev-cert.pem -in apns-dev-cert.p12//3.将 key 和 pem 合并cat PushKey.pem apns-dev-cert.pem > apns-Dev.pem

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2.Cookie(小甜饼

)

//cookie

介绍

由服务器端生成，发送给客户端

客户端将

的

key/value

保存到某个目录下的文本文件内

如果客户端支持

，下次请求同一网站时就可以

直接发送给服务器

名称和值由服务器端开发自己定义

最典型的应用是判定注册用户是否已经登录，记录用户登录信息，简化下次登录的过程

另一个重要应用场合是

“

购物车

”

在

iOS

程序中，默认就支持

，程序员无需做任何处理

如果服务器返回

，会自动保存在沙盒的

Library/Cookies

目录中

/* Cookie的存储策略 */

@property NSHTTPCookieAcceptPolicy cookieAcceptPolicy;  NSHTTPCookieAcceptPolicyAlways,                    永远 NSHTTPCookieAcceptPolicyNever,                     永不 NSHTTPCookieAcceptPolicyOnlyFromMainDocumentDomain 只记录主域名的Cookie  //提示：如果禁用Cookie有些网络访问会不正常！ //这个选项只要知道即可，不建议修改！

/* Cookie

的保存

保存在

沙盒

/Library/Cookies

目录下，以二进制的形式保存

但是仍然能够看到密码的明文，说明不安全！

获取

的方法

// 检查Cookie中是否保存了用户的信息    // 1. 拿出所有的cookieNSArray *cookies = [[NSHTTPCookieStorage sharedHTTPCookieStorage] cookies];    // 2. 遍历cookies检查是否有用户名和密码for (NSHTTPCookie *cookie in cookies) {    /**        NSHTTPCookie中存储的内容                 name: 变量名->变量名&值是从服务器返回的        value: 变量值    */    NSLog(@"%@", cookie);    if ([cookie.name isEqualToString:@"userName"]) { // 用户名        self.nameText.text = cookie.value;    } else if ([cookie.name isEqualToString:@"userPassword"]) { // 密码        self.pwdText.text = cookie.value;    }}// 3. 删除Cookie// 读取所有cookieNSArray *cookies = [[NSHTTPCookieStorage sharedHTTPCookieStorage] cookies]; // 删除cookiefor (NSHTTPCookie *cookie in cookies) {    [[NSHTTPCookieStorage sharedHTTPCookieStorage] deleteCookie:cookie];}

/* Cookie的缺陷 */

Cookie会被附加在每个HTTP请求中，会增加额外的流量

在HTTP请求中的Cookie是明文传递的，因此会有安全隐患，除非使用HTTPS

Cookie的大小限制在4KB左右，不适合存储复杂的数据信息

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3.截图使用场景: iOS 7中的代码代段

// 使用上下文截图,并使用指定的区域裁剪,模板代码- (void)screenShot{    // 将要被截图的view,即窗口的根控制器的view(必须不含状态栏,默认ios7中控制器是包含了状态栏的)    BeyondViewController *beyondVC = self.view.window.rootViewController;    // 背景图片 总的大小    CGSize size = beyondVC.view.frame.size;    // 开启上下文,使用参数之后,截出来的是原图（YES  0.0 质量高）    UIGraphicsBeginImageContextWithOptions(size, YES, 0.0);    // 裁剪的关键代码,要裁剪的矩形范围    CGRect rect = CGRectMake(0, -20, size.width, size.height + 20 );    //注：iOS7以后renderInContext：由drawViewHierarchyInRect：afterScreenUpdates：替代    [beyondVC.view drawViewHierarchyInRect:rect  afterScreenUpdates:NO];    // 从上下文中,取出UIImage    UIImage *snapshot = UIGraphicsGetImageFromCurrentImageContext();    // 添加截取好的图片到图片数组    [_cutImages addObject:snapshot];         // 千万记得,结束上下文(移除栈顶上下文)    UIGraphicsEndImageContext();     }

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4.解决UIButton 按钮重复点击
配合Github上我写的扩展使用，简单实用：

// test    UIButton *testBtn = [UIButton buttonWithType:UIButtonTypeCustom];        testBtn.frame = CGRectMake(100, 100, [UIScreen mainScreen].bounds.size.width-200, [UIScreen mainScreen].bounds.size.height/3);        testBtn.backgroundColor = [UIColor greenColor];    [testBtn setTitleColor:[UIColor redColor] forState:(UIControlStateNormal)];    [testBtn setTitle:@"测试" forState:UIControlStateNormal];        [testBtn addTarget:self action:@selector(goToTestAction:) forControlEvents:UIControlEventTouchUpInside];    // 设置几秒内忽略重复点击    testBtn.JQ_acceptEventInterval = 1;        [self.view addSubview:testBtn];

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5.#pragma mark -- 设置在一个文本中所有特殊字符的特殊颜色

+ (NSMutableAttributedString *)setAllText:(NSString *)allStr andSpcifiStr:(NSString *)specifiStr withColor:(UIColor *)color specifiStrFont:(UIFont *)font {     NSMutableAttributedString *mutableAttributedStr = [[NSMutableAttributedString alloc] initWithString:allStr];    if (color == nil) {        color = [UIColor redColor];    }    if (font == nil) {        font = [UIFont systemFontOfSize:17.];    }    //    NSArray *array = [allStr componentsSeparatedByString:specifiStr];//array.cout-1是所有字符特殊字符出现的次数     NSRange searchRange = NSMakeRange(0, [allStr length]);     NSRange range;    //拿到所有的相同字符的range     while         ((range = [allStr rangeOfString:specifiStr options:0 range:searchRange]).location != NSNotFound) {         //改变多次搜索时searchRange的位置         searchRange = NSMakeRange(NSMaxRange(range), [allStr length] - NSMaxRange(range));         //设置富文本         [mutableAttributedStr addAttribute:NSForegroundColorAttributeName value:color range:range];         [mutableAttributedStr addAttribute:NSFontAttributeName value:font range:range];     }    return mutableAttributedStr;}

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放大缩小

// 放大- (void)shakeToShow:(UIButton*)aView{    CAKeyframeAnimation* animation = [CAKeyframeAnimation animationWithKeyPath:@"transform"];    animation.duration = 0.5;       NSMutableArray *values = [NSMutableArray array];    [values addObject:[NSValue valueWithCATransform3D:CATransform3DMakeScale(0.1, 0.1, 1.0)]];    [values addObject:[NSValue valueWithCATransform3D:CATransform3DMakeScale(1.2, 1.2, 1.0)]];    [values addObject:[NSValue valueWithCATransform3D:CATransform3DMakeScale(0.9, 0.9, 1.0)]];    [values addObject:[NSValue valueWithCATransform3D:CATransform3DMakeScale(1.0, 1.0, 1.0)]];    animation.values = values;    [aView.layer addAnimation:animation forKey:nil];}// 缩小- (void)shakeToHidden:(UIButton*)aView{    CAKeyframeAnimation* animation = [CAKeyframeAnimation animationWithKeyPath:@"transform"];    animation.duration = 0.5;       NSMutableArray *values = [NSMutableArray array];    [values addObject:[NSValue valueWithCATransform3D:CATransform3DMakeScale(1.0, 1.0, 1.0)]];    [values addObject:[NSValue valueWithCATransform3D:CATransform3DMakeScale(0.9, 0.9, 1.0)]];    [values addObject:[NSValue valueWithCATransform3D:CATransform3DMakeScale(1.2, 1.2, 1.0)]];    [values addObject:[NSValue valueWithCATransform3D:CATransform3DMakeScale(0.1, 0.1, 1.0)]];    animation.values = values;    [aView.layer addAnimation:animation forKey:nil];}- (void)showWithAView:(UIButton*)aView{    [CATransaction begin]; {        // start the transform animation from its current value if it's already running        NSValue *fromValue = [aView.layer animationForKey:@"transform"] ? [aView.layer.presentationLayer valueForKey:@"transform"] : [NSValue valueWithCATransform3D:CATransform3DMakeScale(0.5, 0.5, 1)];               CABasicAnimation *scaleAnim = [CABasicAnimation animationWithKeyPath:@"transform"];        scaleAnim.fromValue = fromValue;        scaleAnim.toValue = [NSValue valueWithCATransform3D:CATransform3DIdentity];        [scaleAnim setTimingFunction:[CAMediaTimingFunction functionWithControlPoints:0.8 :2.5 :0.35 :0.5]];        scaleAnim.removedOnCompletion = NO;        scaleAnim.fillMode = kCAFillModeForwards;        scaleAnim.duration = 0.4;        [aView.layer addAnimation:scaleAnim forKey:@"transform"];               CABasicAnimation* fadeInAnim = [CABasicAnimation animationWithKeyPath:@"opacity"];        fadeInAnim.fromValue = [aView.layer.presentationLayer valueForKey:@"opacity"];        fadeInAnim.duration = 0.1;        fadeInAnim.toValue = @1.0;        [aView.layer addAnimation:fadeInAnim forKey:@"opacity"];               aView.layer.opacity = 1.0;    } [CATransaction commit];}- (void)hideWithAView:(UIButton*)aView{    [CATransaction begin]; {        [CATransaction setCompletionBlock:^{            // remove the transform animation if the animation finished and wasn't interrupted            if (aView.layer.opacity == 0.0) [aView.layer removeAnimationForKey:@"transform"];                   }];               CABasicAnimation *scaleAnim = [CABasicAnimation animationWithKeyPath:@"transform"];        scaleAnim.fromValue = [aView.layer.presentationLayer valueForKey:@"transform"];        scaleAnim.toValue = [NSValue valueWithCATransform3D:CATransform3DMakeScale(0.5, 0.5, 1)];        scaleAnim.duration = 0.6;        scaleAnim.removedOnCompletion = NO;        scaleAnim.fillMode = kCAFillModeForwards;        [scaleAnim setTimingFunction:[CAMediaTimingFunction functionWithControlPoints:0.1 :-2 :0.3 :3]];        [aView.layer addAnimation:scaleAnim forKey:@"transform"];               CABasicAnimation* fadeOutAnim = [CABasicAnimation animationWithKeyPath:@"opacity"];        fadeOutAnim.fromValue = [aView.layer.presentationLayer valueForKey:@"opacity"];        fadeOutAnim.toValue = @0.0;        fadeOutAnim.duration = 0.8;        [aView.layer addAnimation:fadeOutAnim forKey:@"opacity"];        aView.layer.opacity = 0.0;    } [CATransaction commit];}

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7.#pragma mark - 抖动动画

- (void)shakeAnimation{    CAKeyframeAnimation *animation = [CAKeyframeAnimation animationWithKeyPath:@"position.x"];    //获取当前View的position坐标    CGFloat positionX = self.layer.position.x;    //设置抖动的范围    animation.values = @[@(positionX-10),@(positionX),@(positionX+10)];    //动画重复的次数    animation.repeatCount = 3;    //动画时间    animation.duration = 0.07;    //设置自动反转    animation.autoreverses = YES;    [self.layer addAnimation:animation forKey:nil];}

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8.iOS - 直接退出应用

//使用-(void)touchesBegan:(NSSet
         
           *)touches withEvent:(UIEvent *)event{    [self exitApplication];}//退出方法- (void)exitApp {[UIView beginAnimations:@"exitApplication" context:nil]; [UIView setAnimationDuration:0.5]; [UIView setAnimationDelegate:self]; [UIView setAnimationTransition:UIViewAnimationTransitionCurlUp forView:self.view.window cache:NO]; [UIView setAnimationDidStopSelector:@selector(animationFinished:finished:context:)]; self.view.window.bounds = CGRectMake(0, 0, 0, 0); [UIView commitAnimations];}- (void)animationFinished:(NSString *)animationID finished:(NSNumber *)finished context:(void *)context { if ([animationID compare:@"exitApplication"] == 0) { //退出   exit(0); }}

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9.iOS - 图片模糊效果

vImage 方式添加通用模糊效果#import 
       
        //加模糊效果，image是图片，blur是模糊度- (UIImage *)blurryImage:(UIImage *)image withBlurLevel:(CGFloat)blur{    if (image==nil)    {       NSLog(@"error:为图片添加模糊效果时，未能获取原始图片");        return nil;    }//模糊度,    if ((blur < 0.1f) || (blur > 2.0f)) {        blur = 0.5f;    }    //boxSize必须大于0    int boxSize = (int)(blur * 100);    boxSize -= (boxSize % 2) + 1;    NSLog(@"boxSize:%i",boxSize);    //图像处理    CGImageRef img = image.CGImage;    //需要引入#import 
        
             /*     This document describes the Accelerate Framework, which contains C APIs for vector and matrix math, digital signal processing, large number handling, and image processing.     本文档介绍了Accelerate Framework，其中包含C语言应用程序接口（API）的向量和矩阵数学，数字信号处理，大量处理和图像处理。     */    //图像缓存,输入缓存，输出缓存    vImage_Buffer inBuffer, outBuffer;    vImage_Error error;    //像素缓存    void *pixelBuffer;    //数据源提供者，Defines an opaque type that supplies Quartz with data.    CGDataProviderRef inProvider = CGImageGetDataProvider(img);    // provider’s data.    CFDataRef inBitmapData = CGDataProviderCopyData(inProvider);    //宽，高，字节/行，data    inBuffer.width = CGImageGetWidth(img);    inBuffer.height = CGImageGetHeight(img);    inBuffer.rowBytes = CGImageGetBytesPerRow(img);    inBuffer.data = (void*)CFDataGetBytePtr(inBitmapData);    //像数缓存，字节行*图片高    pixelBuffer = malloc(CGImageGetBytesPerRow(img) * CGImageGetHeight(img));    outBuffer.data = pixelBuffer;    outBuffer.width = CGImageGetWidth(img);    outBuffer.height = CGImageGetHeight(img);    outBuffer.rowBytes = CGImageGetBytesPerRow(img);       // 第三个中间的缓存区,抗锯齿的效果    void *pixelBuffer2 = malloc(CGImageGetBytesPerRow(img) * CGImageGetHeight(img));    vImage_Buffer outBuffer2;    outBuffer2.data = pixelBuffer2;    outBuffer2.width = CGImageGetWidth(img);    outBuffer2.height = CGImageGetHeight(img);    outBuffer2.rowBytes = CGImageGetBytesPerRow(img);    //Convolves a region of interest within an ARGB8888 source image by an implicit M x N kernel that has the effect of a box filter.    error = vImageBoxConvolve_ARGB8888(&inBuffer, &outBuffer2, NULL, 0, 0, boxSize, boxSize, NULL, kvImageEdgeExtend);    error = vImageBoxConvolve_ARGB8888(&outBuffer2, &inBuffer, NULL, 0, 0, boxSize, boxSize, NULL, kvImageEdgeExtend);    error = vImageBoxConvolve_ARGB8888(&inBuffer, &outBuffer, NULL, 0, 0, boxSize, boxSize, NULL, kvImageEdgeExtend);       if (error) {        NSLog(@"error from convolution %ld", error);    }//    NSLog(@"字节组成部分：%zu",CGImageGetBitsPerComponent(img));    //颜色空间DeviceRGB    CGColorSpaceRef colorSpace = CGColorSpaceCreateDeviceRGB();    //用图片创建上下文,CGImageGetBitsPerComponent(img),7,8    CGContextRef ctx = CGBitmapContextCreate(                                             outBuffer.data,                                             outBuffer.width,                                             outBuffer.height,                                             8,                                             outBuffer.rowBytes,                                             colorSpace,                                             CGImageGetBitmapInfo(image.CGImage));    //根据上下文，处理过的图片，重新组件    CGImageRef imageRef = CGBitmapContextCreateImage (ctx);    UIImage *returnImage = [UIImage imageWithCGImage:imageRef];    //clean up    CGContextRelease(ctx);    CGColorSpaceRelease(colorSpace);       free(pixelBuffer);    free(pixelBuffer2);    CFRelease(inBitmapData);    //CGColorSpaceRelease(colorSpace);   //多余的释放    CGImageRelease(imageRef);    return returnImage;}

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10.优化建议

优化建议：

避免图层混合
· 确保控件的opaque属性设置为true，确保backgroundColor和父视图颜色一致且不透明

· 如无特殊需要，不要设置低于1的alpha值

· 确保UIImage没有alpha通道

避免临时转换
· 确保图片大小和frame一致，不要在滑动时缩放图片

· 确保图片颜色格式被GPU支持，避免劳烦CPU转换

慎用离屏渲染
· 绝大多数时候离屏渲染会影响性能

· 重写drawRect方法，设置圆角、阴影、模糊效果，光栅化都会导致离屏渲染

· 设置阴影效果是加上阴影路径

· 滑动时若需要圆角效果，开启光栅化

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11.iOS - 收起键盘

对应控件 resignFirstResponder

touchesBegin 中[self.view endEditing:YES];[[UIApplication sharedApplication]sendAction:@selector(resignFirstResponder) to:nil from:nil forEvent:nil];[[[UIApplication sharedApplication]keyWindow]endEditing:YES];

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12.tab

Bar的隐藏与消失

// tabBar的隐藏与消失- (void)hidesTabBar:(BOOL)hidden{    [UIView beginAnimations:nil context:NULL];    [UIView setAnimationDuration:0];       for (UIView *view in self.tabBarController.view.subviews){               if ([view isKindOfClass:[UITabBar class]]) {            if (hidden) {                [view setFrame:CGRectMake(view.frame.origin.x, [UIScreen mainScreen].bounds.size.height, view.frame.size.width , view.frame.size.height)];            }else{                [view setFrame:CGRectMake(view.frame.origin.x, [UIScreen mainScreen].bounds.size.height - 49, view.frame.size.width, view.frame.size.height)];            }        }else{            if([view isKindOfClass:NSClassFromString(@"UITransitionView")]){                if (hidden){                    [view setFrame:CGRectMake(view.frame.origin.x, view.frame.origin.y, view.frame.size.width, [UIScreen mainScreen].bounds.size.height)];                }else{                                       [view setFrame:CGRectMake(view.frame.origin.x, view.frame.origin.y, view.frame.size.width, [UIScreen mainScreen].bounds.size.height - 49 )];                }            }        }    }    [UIView commitAnimations];}

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13.判断页面消失或出现时是push还是pop操作：

- (void)viewWillDisappear:(BOOL)animated {    NSArray *viewControllers = self.navigationController.viewControllers;//获取当前的视图控制其    if (viewControllers.count > 1 && [viewControllers objectAtIndex:viewControllers.count-2] == self) {        //当前视图控制器在栈中，故为push操作        NSLog(@"push");    } else if ([viewControllers indexOfObject:self] == NSNotFound) {        //当前视图控制器不在栈中，故为pop操作        NSLog(@"pop");    }}

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