在iOS中從NSArray中檢索數據

Question

我對此很新。我已經將所有NSDictionary存儲爲NSArray，現在我想要檢索數據。我不知道該怎麼做。請幫助我。我想獲得密鑰和數據，並基於想要顯示UITableView中的數據。我只有檢索部分正在等待處理。

下面是我的NSArray：

{ 
    Code = MCP3441G; 
    "Needle Description" = "1/2 Circle Round Body MH"; 
    "Needle Dimension" = "31 MM"; 
    "No. of foils per box" = 12; 
    "Per box maximum retail price" = 7440; 
    "Per box price to retailers & hospitals" = 5474; 
    Size = "2/0"; 
    "Suture type and length" = "MONOCRYL monofilament 70 CM Violet"; 
    nid = 86; 
}, 
    { 
    Code = NW1641; 
    "Needle Description" = "1/2 Circle Round Body"; 
    "Needle Dimension" = "30 MM"; 
    "No. of foils per box" = 12; 
    "Per box maximum retail price" = 4800; 
    "Per box price to retailers & hospitals" = 3510; 
    Size = "2/0 Only"; 
    "Suture type and length" = "MONOCRYL Undyed Monofilament 70 CM"; 
    nid = 86; 
}, 
    { 
    Code = NW1642; 
    "Needle Description" = "1/2 Circle Round Body"; 
    "Needle Dimension" = "30 MM"; 
    "No. of foils per box" = 12; 
    "Per box maximum retail price" = 4800; 
    "Per box price to retailers & hospitals" = 3510; 
    Size = "1/0"; 
    "Suture type and length" = "MONOCRYL Undyed Monofilament 70 CM"; 
    nid = 86; 
}, 
    { 
    Code = NW1648; 
    "Needle Description" = "3/8 Circle Round Body"; 
    "Needle Dimension" = "16 MM"; 
    "No. of foils per box" = 12; 
    "Per box maximum retail price" = 3600; 
    "Per box price to retailers & hospitals" = 2687; 
    Size = "4/0"; 
    "Suture type and length" = "MONOCRYL Undyed Monofilament 70 cm"; 
    nid = 86; 
}, 
    { 
    Code = NW1663; 
    "Needle Description" = "1/2 Circle Oval Round Body J.B"; 
    "Needle Dimension" = "22 MM"; 
    "No. of foils per box" = 12; 
    "Per box maximum retail price" = 5280; 
    "Per box price to retailers & hospitals" = 3870; 
    Size = "3/0"; 
    "Suture type and length" = "MONOCRYL Undyed Monofilament 70 CM"; 
    nid = 86; 
}, 
    { 
    Code = NW1664; 
    "Needle Description" = "1/2 Circle Oval Round Body J.B"; 
    "Needle Dimension" = "26 MM"; 
    "No. of foils per box" = 12; 
    "Per box maximum retail price" = 5880; 
    "Per box price to retailers & hospitals" = 4347; 
    Size = "3/0"; 
    "Suture type and length" = "MONOCRYL Undyed Monofilament 70 CM"; 
    nid = 86; 
}, 

Answer 1

有訪問數據的一些方法。首先，我建議你看一下文檔都的NSArray（https://developer.apple.com/library/mac/documentation/Cocoa/Reference/Foundation/Classes/NSArray_Class/）和NSDictionary中（https://developer.apple.com/library/mac/documentation/Cocoa/Reference/Foundation/Classes/NSDictionary_Class/）

要訪問的NSArray的某個元素，你可以做這樣的事情：

NSDictionary *dict = (NSDictionary*) myArray[0]; //gets the first item of the array. 

一旦你有在字典中，有很多可能的方式來訪問密鑰和數據。如果你有鑰匙，你想有一個特定的值，你可以做這樣的事情：

NSString *desc = dict[@"Needle Description"]; //gets the value for the key Needle Description 

（注意：上述使用速記 - 你也可以做更詳細的[dict objectForKey:@"Needle Description"]）

你可以還可以得到所有的鍵的陣列（在表中列出，當你在你的問題中所述），但這樣做是這樣的：

NSArray *keys = [dict allKeys]; 

然後，你可以通過這些按鍵循環，輪詢的值項按項目。

再次檢查文檔以獲取更多信息。