有没有一种方法可以将Swift字典漂亮地打印到控制台上? [英] Is there a way to pretty print Swift dictionaries to the console?

问题描述

NSDictionary *dictionary = @{@"A" : @"alfa",
                             @"B" : @"bravo",
                             @"C" : @"charlie",
                             @"D" : @"delta",
                             @"E" : @"echo",
                             @"F" : @"foxtrot"};
NSLog(@"%@", dictionary.description);

在控制台上打印出以下内容:

prints out the following on the console:

{
    A = alfa;
    B = bravo;
    C = charlie;
    D = delta;
    E = echo;
    F = foxtrot;
}

---

let dictionary: [String : String] = ["A" : "alfa",
                                     "B" : "bravo",
                                     "C" : "charlie",
                                     "D" : "delta",
                                     "E" : "echo",
                                     "F" : "foxtrot"];
print(dictionary)

在控制台上打印出以下内容:

prints out the following on the console:

["B": "bravo", "A": "alfa", "F": "foxtrot", "C": "charlie", "D": "delta", "E": "echo"]

Swift中是否有一种方法可以将其带到漂亮的打印字典中，其中每个键值对都占一行?

Is there a way in Swift to get it to pretty print dictionaries where each key-value pair occupies a new line?

推荐答案

您可以使用 dump (例如，如果目标是检查字典). dump是Swift标准库的一部分.

You could use dump, for example, if the goal is to inspect the dictionary. dump is part of Swift's standard library.

用法:

let dictionary: [String : String] = ["A" : "alfa",
                                     "B" : "bravo",
                                     "C" : "charlie",
                                     "D" : "delta",
                                     "E" : "echo",
                                     "F" : "foxtrot"]

dump(dictionary)

输出:

dump通过反射(镜像)打印对象的内容.

dump prints the contents of an object via reflection (mirroring).

阵列的详细视图:

let names = ["Joe", "Jane", "Jim", "Joyce"]
dump(names)

打印:

▿4个元素
-[0]:乔
-[1]:简
-[2]:吉姆
-[3]:乔伊斯

▿ 4 elements
- [0]: Joe
- [1]: Jane
- [2]: Jim
- [3]: Joyce

对于字典:

let attributes = ["foo": 10, "bar": 33, "baz": 42]
dump(attributes)

打印:

▿3个键/值对
▿[0] :( 2个元素)
-.0:bar
-.1:33
▿[1] :( 2个元素)
-.0:baz
-.1:42
▿[2] :( 2个元素)
-.0:foo
-.1:10

▿ 3 key/value pairs
▿ [0]: (2 elements)
- .0: bar
- .1: 33
▿ [1]: (2 elements)
- .0: baz
- .1: 42
▿ [2]: (2 elements)
- .0: foo
- .1: 10

dump被声明为dump(_:name:indent:maxDepth:maxItems:).

第一个参数没有标签.

还有其他可用参数，例如name可以为要检查的对象设置标签:

There's other parameters available, like name to set a label for the object being inspected:

dump(attributes, name: "mirroring")

打印:

▿镜像:3个键/值对
▿[0] :( 2个元素)
-.0:bar
-.1:33
▿[1] :( 2个元素)
-.0:baz
-.1:42
▿[2] :( 2个元素)
-.0:foo
-.1:10

▿ mirroring: 3 key/value pairs
▿ [0]: (2 elements)
- .0: bar
- .1: 33
▿ [1]: (2 elements)
- .0: baz
- .1: 42
▿ [2]: (2 elements)
- .0: foo
- .1: 10

您还可以选择使用maxItems:仅打印特定数量的项目，使用maxDepth:解析到一定深度的对象，并使用indent:更改打印对象的压痕.

You can also choose to print only a certain number of items with maxItems:, to parse the object up to a certain depth with maxDepth:, and to change the indentation of printed objects with indent:.

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