多值參數(shù)

如果一個參數(shù)對應著多個值，那么直接按照"參數(shù)=值&參數(shù)=值"的方式拼接

• 多值參數(shù)的寫法
  //錯誤的寫法: http://120.25.226.186:32812/weather?place=Beijing&guangzhou
  //正確的寫法: http://120.25.226.186:32812/weather?place=Beijing&place=guangzhou
  示例代碼:

    -(void)test
    {
        //1.確定URL
        NSURL *url = [NSURL URLWithString:@"http://120.25.226.186:32812/weather?place=Beijing&place=Guangzhou"];
        //2.創(chuàng)建請求對象
        NSURLRequest *request = [NSURLRequest requestWithURL:url];

        //3.發(fā)送請求
        [NSURLConnection sendAsynchronousRequest:request queue:[NSOperationQueue mainQueue] completionHandler:^(NSURLResponse * _Nullable response, NSData * _Nullable data, NSError * _Nullable connectionError) {

            //4.解析
            NSLog(@"%@",[NSJSONSerialization JSONObjectWithData:data options:kNilOptions error:nil]);
        }];
    }

中文輸出

• 如何解決字典和數(shù)組中輸出亂碼的問題
  給字典和數(shù)組添加一個分類灯谣，重寫descriptionWithLocale方法扁藕，在該方法中拼接元素格式化輸出削樊。
  -(nonnull NSString *)descriptionWithLocale:(nullable id)locale
  示例代碼:
  • 重寫字典的descriptionWithLocale方法

#import "NSDictionary+log.h"
@implementation NSDictionary (log)
//重寫字典的descriptionWithLocale:indent:方法,實現(xiàn)中文的輸出
-(NSString *)descriptionWithLocale:(id)locale indent:(NSUInteger)level
{
    //創(chuàng)建一個可變字符串,用于拼接輸出的內容
    NSMutableString * strM = [NSMutableString string];
    [strM appendString:@"\t{\n"];
    //使用迭代法遍歷字典中的鍵值對
    [self enumerateKeysAndObjectsUsingBlock:^(id  _Nonnull key, id  _Nonnull obj, BOOL * _Nonnull stop) {
        [strM appendFormat:@"\t%@:",key];
        [strM appendFormat:@"%@,\n",obj];
    }];
    [strM appendString:@"\t}"];
    //刪除最后一個逗號
    NSRange range = [strM rangeOfString:@"," options:NSBackwardsSearch];
    if (range.location != NSNotFound) {
        [strM deleteCharactersInRange:range];
    }
    return strM;
}
@end

• 重寫數(shù)組的descriptionWithLocale方法

@implementation NSArray (log)
//重寫數(shù)組的descriptionWithLocale:indent方法
-(NSString *)descriptionWithLocale:(id)locale indent:(NSUInteger)level
{
    NSMutableString * strM = [NSMutableString string];
    [strM appendString:@"\t[\n"];
    //用迭代法遍歷數(shù)組
    [self enumerateObjectsUsingBlock:^(id  _Nonnull obj, NSUInteger idx, BOOL * _Nonnull stop) {
        [strM appendFormat:@"%@,\n",obj];
    }];
    [strM appendString:@"\t]"];
    //刪除最后一個逗號
    NSRange range = [strM rangeOfString:@"," options:NSBackwardsSearch];
    if (range.location != NSNotFound) {
        [strM deleteCharactersInRange:range];
    }
    return strM;
}
@end