巧招大杂会

ARC与MRC互转

ARC项目添加MRC标记（-fno-objc-arc）

MRC项目添加ARC标记（-fobjc-arc）

获取UUID

NSString *idfv = [[[UIDevice currentDevice] identifierForVendor] UUIDString];

宏定义：区分设备与模拟器

#if TARGET_IPHONE_SIMULATOR
XXXXX
#else
XXXXX
#endif

ipa打包

运行，创建文件夹Payload,    打开文件夹Products 将.app 放入Payload，压缩，改后缀为ipa.

AFNetworking

JSON的“” 转换为nil

使用AFNetworking 时， 使用

AFJSONResponseSerializer *response = [[AFJSONResponseSerializer alloc] init];

response.removesKeysWithNullValues = YES;

_sharedClient.responseSerializer = response;

识别图片二维码

+(NSString *)dealLongPress:(UIImageView *)imageView{
    NSString *scannedResult = nil;
    if(imageView.image){
        //1. 初始化扫描仪，设置设别类型和识别质量
        CIDetector*detector = [CIDetector detectorOfType:CIDetectorTypeQRCode context:nil options:@{ CIDetectorAccuracy : CIDetectorAccuracyHigh }];
        //2. 扫描获取的特征组
        NSArray *features = [detector featuresInImage:[CIImage imageWithCGImage:imageView.image.CGImage]];
        //3. 获取扫描结果
        if(features.count > 0)
        {
            CIQRCodeFeature *feature = [features objectAtIndex:0];
            scannedResult = feature.messageString;
        }
        else
        {
            return nil;
        }
    }
    return scannedResult;
}

序列化

/*!  
 * @brief 把格式化的JSON格式的字符串转换成字典  
 * @param jsonString JSON格式的字符串  
 * @return 返回字典  
 */  
+ (NSDictionary *)dictionaryWithJsonString:(NSString *)jsonString {  
    if (jsonString == nil) {  
        return nil;  
    }  
      
    NSData *jsonData = [jsonString dataUsingEncoding:NSUTF8StringEncoding];  
    NSError *err;  
    NSDictionary *dic = [NSJSONSerialization JSONObjectWithData:jsonData  
                                                        options:NSJSONReadingMutableContainers  
                                                          error:&err];  
    if(err) {  
        NSLog(@"json解析失败：%@",err);  
        return nil;  
    }  
    return dic;  
}