if中的條件的意外結果，使用&&

Question

我使用JSON解析器進行解析。我將數據存儲到searchURL，這是一個NSMutableDictionary。我得到了一個JSON響應。

 ksearchKeyHeadline = "noresults" 
     ksearchKeyNewsText = "http://172.15.12.98:8080//...... url." 
     ksearchKeyIssuersText= "noresults" 

這裏我提出條件：

if ([[searchURL objectForKey:KSearchKeyHeadline] isEqualToString:@"noresults"] && 
    [[searchURL objectForKey:kSearchKeyNewsText] isEqualToString:@"noresults"] && 
    [[searchURL objectForKey:kSearchKeyIssuerText] isEqualToString:@"noresults"]) { 
    NSURLRequest *req; 
    req=[NSURLRequest requestWithURL:[NSURL URLWithString:[NSString stringWithFormat:kSearchBarNoResult,text.text]]]; 
    [[[featuredAsset viewControler] iWebview] loadRequest:req]; 
} 
else if([searchURL objectForKey:KSearchKeyHeadline]!=@"noresults" && 
     [searchURL objectForKey:kSearchKeyNewsText]!=@"noresults" && 
     [searchURL objectForKey:kSearchKeyIssuerText]!=@"noresults"){ 
    NSURLRequest *req; 
    req=[NSURLRequest requestWithURL:[NSURL URLWithString:[NSString stringWithString:kSearchBarHeadlinesURL]]]; 
    [[[featuredAsset viewControler] iWebview] loadRequest:req]; 
} 
else if([[searchURL objectForKey:kSearchKeyNewsText]isEqualToString:@"noresults"] && 
     [searchURL objectForKey:kSearchKeyNewsText]!=@"noresults" && 
     [[searchURL objectForKey:kSearchKeyIssuerText]isEqualToString:@"noresults"]){ 
    NSURLRequest *req; 
    req=[NSURLRequest requestWithURL:[NSURL URLWithString:[NSString stringWithString:kSearchBarNewsTextURL]]]; 
    [[[featuredAsset viewControler]iWebview]loadRequest:req]; 
} 

的問題是，它調用這兩個else if條件。我必須調用最後的條件。我知道符號&&將檢查條件 - 當整個條件爲真時，它將返回true。我做錯了什麼？

Answer 1

你不能比較NSString的是這樣的：

[searchURL objectForKey:KSearchKeyHeadline]!=@"noresults" 

你需要使用isEqualToString：

[[searchURL objectForKey:KSearchKeyHeadline] isEqualToString: @"noresults"] 

而且你ksearchKeyHeadline是"noresult"，不"noresults"。