Question

我使用以下代码动态地将元素存储在数组中并稍后检索

for (int i = 0; i< [companyNames count]; i++){
    testimonialsArray = [[NSMutableArray alloc]init];
    testimonialsComplementedArray = [[NSMutableArray alloc]init];
    [testimonialsArray addObject:companyNames[i] ];
    [testimonialsComplementedArray addObject:texts[i]];

    NSLog(@"Compliments %@",testimonialsComplementedArray);
}

但它只打印已添加到数组的最后一个副本。如何检索所有元素？

以下是公司名称，

"General Marketing Company",
 "United Enterprises, Chennai",
 "Hari Match Industries"

Answer 1

testimonialsArray = [[NSMutableArray alloc]init]; // have to init out side the loop
testimonialsComplementedArray = [[NSMutableArray alloc]init]; // have to init out side the loop
for (int i = 0; i< [companyNames count]; i++){
    [testimonialsArray addObject:companyNames[i] ];
    [testimonialsComplementedArray addObject:texts[i]];        
}
NSLog(@"Compliments %@",testimonialsComplementedArray);

Answer 2

如果你在每次内存初始化的时候在循环内部启动，那么在for循环上面分配testimonialsArray = [[NSMutableArray alloc]init];，所以最后的值只能在最后得到输出，就像

testimonialsArray = [[NSMutableArray alloc]init];
testimonialsComplementedArray = [[NSMutableArray alloc]init]
 for (int i = 0; i< [companyNames count]; i++){
  [testimonialsArray addObject:companyNames[i] ];
[testimonialsComplementedArray addObject:texts[i]];
 }

NSLog(@"Compliments %@",testimonialsComplementedArray);

Answer 3

每次都在for循环中分配可变数组因为它初始化数组并且每次都在其中添加对象。总是更好地在ViewDidLoad方法中分配任何对象。

Answer 4

试试这样。

testimonialsArray = [[NSMutableArray alloc]init];
testimonialsComplementedArray = [[NSMutableArray alloc]init];

for (int i = 0; i< [companyNames count]; i++){
[testimonialsArray addObject:companyNames[i] ];
[testimonialsComplementedArray addObject:texts[i]];

}
NSLog(@"Compliments %@",testimonialsComplementedArray);

NSMutablearray不打印所有数组元素

4 个答案: