【Foundation-26-2】#import <Foundation/NSDictionary.h>字典创建

最新推荐文章于 2019-07-28 11:54:07 发布

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最新推荐文章于 2019-07-28 11:54:07 发布

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CC 4.0 BY-SA版权

本文链接：https://blog.youkuaiyun.com/u013059266/article/details/49079353

本文详细介绍了NSDictionary类的各种创建方法，包括使用类方法和实例方法创建字典的方式，并提供了具体的代码示例。此外还展示了如何从文件路径或URL加载字典内容。

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@interface NSDictionary (NSDictionaryCreation)

类方法

+ (instancetype)dictionary;

+ (instancetype)dictionaryWithObject:(id)object forKey:(id <NSCopying>)key;

+ (instancetype)dictionaryWithObjectsAndKeys:(id)firstObject, ... NS_REQUIRES_NIL_TERMINATION;

+ (instancetype)dictionaryWithDictionary:(NSDictionary *)dict;

+ (instancetype)dictionaryWithObjects:(NSArray *)objects forKeys:(NSArray *)keys;

    NSDictionary *dic1 = [NSDictionary dictionary];
    dic1 = @{@"key1":@"value1",@"key2":@"vluue2"};
    
    NSDictionary *dic2 = [NSDictionary dictionaryWithObject:@"obj" forKey:@"key"];
    
    NSDictionary *dic3 = [NSDictionary dictionaryWithDictionary:dic1];
    
    NSArray *objArr = @[@"obj1",@"obj2"];
    NSArray *keyArr = @[@"key1",@"key2"];
    NSDictionary *dic4 = [NSDictionary dictionaryWithObjects:objArr forKeys:keyArr];

实例方法

- (instancetype)initWithObjectsAndKeys:(id)firstObject, ... NS_REQUIRES_NIL_TERMINATION;

- (instancetype)initWithDictionary:(NSDictionary *)otherDictionary;

- (instancetype)initWithDictionary:(NSDictionary *)otherDictionary copyItems:(BOOL)flag;

- (instancetype)initWithObjects:(NSArray *)objects forKeys:(NSArray *)keys;

    NSDictionary *dic1 = [NSDictionary dictionary];
    dic1 = @{@"key1":@"value1",@"key2":@"vluue2"};
    
    NSDictionary *dic2 = [[NSDictionary alloc]initWithObjectsAndKeys:@"value1",@"key1",@"value2",@"key2",nil];
    
    NSDictionary *dic3 = [[NSDictionary alloc]initWithDictionary:dic1];
    
    NSArray *objArr = @[@"obj1",@"obj2"];
    NSArray *keyArr = @[@"key1",@"key2"];
    NSDictionary *dic4 = [[NSDictionary alloc]initWithObjects:objArr forKeys:keyArr];

+ (NSDictionary *)dictionaryWithContentsOfFile:(NSString *)path;

+ (NSDictionary *)dictionaryWithContentsOfURL:(NSURL *)url;

- (NSDictionary *)initWithContentsOfFile:(NSString *)path;

- (NSDictionary *)initWithContentsOfURL:(NSURL *)url;

    NSString *path = [[NSBundle mainBundle]pathForResource:@"testArray" ofType:@"plist"];

    NSDictionary *dic1 = [NSDictionary dictionaryWithContentsOfFile:path];
    NSLog(@"%@",dic1);
    
    NSDictionary *dic2 = [[NSDictionary alloc]initWithContentsOfFile:path];
    NSLog(@"%@",dic2);

url 类似

@end