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标题: IOS常用方法总结 [打印本页]

作者: 18120184391 时间: 2015-10-9 21:46
标题: IOS常用方法总结
1.某个点是否在某个frame里面

CGRectContainsPoint(button.frame, loc)

2.图片裁剪成小图片
//裁剪图片
- (UIImage *)imageClipWithImage:(UIImage *)image andindex:(int)index
{
CGFloat y = 0;
CGFloat w = 40;
CGFloat h = 47;
CGFloat x = index * w;

CGFloat scale = [UIScreen mainScreen].scale;

x *= scale;
y *= scale;
w *= scale;
h *= scale;

//剪切图片
CGImageRef cgImage = CGImageCreateWithImageInRect(image.CGImage, CGRectMake(x, y, w, h));
UIImage *clipImage = [UIImage imageWithCGImage:cgImage];

return clipImage;
}

3.创建一个刷新的对象每秒60次
CADisplayLink *link = [CADisplayLink displayLinkWithTarget:self selector:@selector(startRotation)];
[link addToRunLoop:[NSRunLoop currentRunLoop] forMode:NSDefaultRunLoopMode];

4.执行玩核心动画执行

anim.delegate = self;
- (void)animationDidStop:(CAAnimation *)anim finished:(BOOL)flag

5.从storyboard中获取导航控制器

UIStoryboard *sb = [UIStoryboard storyboardWithName:storyboard bundle:nil];

UINavigationController *nav = [sb instantiateInitialViewController];

6.从webView加载网页步骤

//获取webView
UIWebView *webView = (UIWebView *)self.view;

webView.delegate = self;

//创建url
// NSURL *url = [NSURL URLWithString:@"http://www.baidu.com"];
NSURL *url = [[NSBundle mainBundle] URLForResource:self.help.html withExtension:nil];

//创建请求对象
NSURLRequest *request = [NSURLRequest requestWithURL:url];

//加载请求对象
[webView loadRequest:request];

7.网页加载完成后执行的jscode

//加载网页完毕执行的方法
-(void)webViewDidFinishLoad:(UIWebView *)webView
{
NSString *jsCode = [NSString stringWithFormat:@"document.location.href = '#%@';",self.help.ID];

[webView stringByEvaluatingJavaScriptFromString:jsCode];
}

8.发短信、打电话、跳转到app各种操作

跳转到appAtore
- (void)jumpAppStore
{
NSString *path = @"https://www.baidu.com";

NSURL *url = [NSURL URLWithString:path];

UIApplication *app = [UIApplication sharedApplication];

[app openURL:url];
}

打电话
- (void)jumpAppStore
{
NSString *details = @“123456789”;

NSString *number = [NSString stringWithFormat:@"tel://%@",details];

NSURL *url = [NSURL URLWithString:number];

[[UIApplication sharedApplication] openURL:url];
}

发短信
- (void)jumpAppStore
{
NSString *number = [NSString stringWithFormat:@"sms://13837369891"];

NSURL *url = [NSURL URLWithString:number];

[[UIApplication sharedApplication] openURL:url];
}

//发短信的另一种方式
- (void)jumpAppStore
{
MFMessageComposeViewController *vc = [[MFMessageComposeViewController alloc] init];
vc.body = @"阿发的说法都是";
vc.recipients = @[@"123213211231",@"121241141212"];

[self presentViewController:vc animated:YES completion:nil];
}

9.图片的拉伸

//设置登录按钮的背景图片
UIImage *normal = [UIImage imageNamed:@"RedButton"];
//拉伸背景图片
normal = [normal stretchableImageWithLeftCapWidth:normal.size.width * 0.5 topCapHeight:normal.size.height * 0.5];

10.push控制器时隐藏底部的tabbar

//push控制器时隐藏底部的tabbar
- (void)pushViewController:(UIViewController *)viewController animated:(BOOL)animated
{
        viewController.hidesBottomBarWhenPushed = YES;
        [super pushViewController:viewController animated:animated];
}

11.图片裁剪的步骤

   1.添加图片
      2.创建上下文（和图片大小一致）
      3.获取上下文
4.绘制裁剪图形
5.把路径加载到上下文
6.执行裁剪
7.把图片绘制到上下文
8.获取裁剪的图片
9.关闭上下文
10.保存

//保存到相册
UIImageWriteToSavedPhotosAlbum(clipImage, nil, nil, nil);

// 保存到沙盒中的Doc中
NSString *docpath = [NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES) lastObject];
NSString *filePath = [docpath stringByAppendingPathComponent:@"icon.png"];
NSData *data = UIImagePNGRepresentation(clipImage);
[data writeToFile:filePath atomically:YES];

11.截屏操作的步骤

      // 创建上下文
      UIGraphicsBeginImageContextWithOptions(self.view.frame.size, NO, 0.0);

      // 获取上下文
      CGContextRef ctx = UIGraphicsGetCurrentContext();

      // 将获取view的内容渲染上下文
      [self.view.layer renderInContext:ctx];

      // 获取image
      UIImage *iconImage = UIGraphicsGetImageFromCurrentImageContext();

      // 结束
      UIGraphicsEndImageContext();

      // 保存
      UIImageWriteToSavedPhotosAlbum(iconImage, nil, nil, nil);

11.URL出现中文需要百分号转义

urlString = [urlString stringByAddingPercentEscapesUsingEncoding:NSUTF8StringEncoding];

12.指纹识别

使用步骤:
{
      1> 导入框架;
#import <LocalAuthentication/LocalAuthentication.h>

      2> 指纹识别的实现:
      {
         1. 需要判断手机系统版本是否是 iOS 8.0 以上的版本.只有 iOS 8.0 以上才支持.

         // 获得当前系统版本号
         float version = [UIDevice currentDevice].systemVersion.floatValue;

         if (version < 8.0 ) // 判断当前系统版本
         {
            NSLog(@"系统版本太低,请升级至最新系统");
            return;
         }

         2. 实例化指纹识别对象,判断当前设备是否支持指纹识别功能(是否带有TouchID).

         // 1> 实例化指纹识别对象
         LAContext *laCtx = [[LAContext alloc] init];

         // 2> 判断当前设备是否支持指纹识别功能.
         if (![laCtx canEvaluatePolicy:LAPolicyDeviceOwnerAuthenticationWithBiometrics error:NULL])
         { // 如果设备不支持指纹识别功能

            NSLog(@"该设备不支持指纹识别功能");

            return;
         };

         3.指纹登陆(默认是异步方法)
         // 指纹登陆
         [laCtx evaluatePolicy:LAPolicyDeviceOwnerAuthenticationWithBiometrics localizedReason:@"指纹登陆" reply:^(BOOL success, NSError *error)
            {
               // 如果成功,表示指纹输入正确.
               if (success) {
                  NSLog(@"指纹识别成功!");

               }else
               {
                  NSLog(@"指纹识别错误,请再次尝试");
               }
         }];
      }
}
}

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