每日一练：OC中的NSarray和NSMutableArray

最新推荐文章于 2025-05-16 17:16:02 发布

Llingmiao

最新推荐文章于 2025-05-16 17:16:02 发布

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分类专栏： OC

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本文介绍了一个使用Objective-C进行数组操作的例子，包括创建不同类型的数组、遍历数组元素、添加和移除对象等基本操作。

#import <Foundation/Foundation.h>

int main(int argc, const char * argv[]) {

@autoreleasepool {

// insert code here...

//Array A

NSArray *myArraya = @[@"China",@"USA",@"France"];

NSLog(@"The Array A is %@", myArraya);

//Array B

NSDate *datea = [NSDate date];

sleep(2);

NSDate *dateb = [NSDate date];

sleep(2);

NSDate *datec = [NSDate date];

NSArray *myArrayb = @[datea, dateb, datec];

NSLog(@"The Array B is %@", myArrayb);

NSLog(@"The first value of array b is %@", myArrayb[0]);

NSLog(@"The third value of array b is %@", myArrayb[2]);

NSLog(@"The count num of array b is %lu", [myArrayb count]);

//*遍历数组的值

for(int i = 0; i < [myArrayb count]; i++){

NSDate *d = myArrayb[i];

NSLog(@"The date is %@", d);

}

//*遍历数组的值-方法2

for(NSDate *dd in myArrayb){

NSLog(@"The second date is %@", dd);

}

//数组3 NSMutableArray

NSDate *today = [NSDate date];

NSDate *yesterday = [today dateByAddingTimeInterval:-24*60*60];

NSDate *tomorrow = [today dateByAddingTimeInterval:24*60*60];

NSMutableArray *myArrayC = [NSMutableArray array];

[myArrayC addObject:today];

[myArrayC addObject:tomorrow];

NSLog(@"My Array C is : %@", myArrayC);

[myArrayC insertObject:yesterday

atIndex:0];

for(NSDate *dc in myArrayC){

NSLog(@"The Array C is : %@",dc);

}

[myArrayC removeObjectAtIndex:0];

NSLog(@"The Array C has updated to : %@", myArrayC);

}

return 0;

}

Result:

2018-03-11 00:36:18.490239+0800 TOCNSArraya[62051:14140071] The Array A is (

China,

USA,

France

)

2018-03-11 00:36:22.503433+0800 TOCNSArraya[62051:14140071] The Array B is (

"2018-03-10 16:36:18 +0000",

"2018-03-10 16:36:20 +0000",

"2018-03-10 16:36:22 +0000"

)

2018-03-11 00:36:22.503532+0800 TOCNSArraya[62051:14140071] The first value of array b is Sun Mar 11 00:36:18 2018

2018-03-11 00:36:22.503583+0800 TOCNSArraya[62051:14140071] The third value of array b is Sun Mar 11 00:36:22 2018

2018-03-11 00:36:22.503603+0800 TOCNSArraya[62051:14140071] The count num of array b is 3

2018-03-11 00:36:22.503689+0800 TOCNSArraya[62051:14140071] The date is Sun Mar 11 00:36:18 2018

2018-03-11 00:36:22.503736+0800 TOCNSArraya[62051:14140071] The date is Sun Mar 11 00:36:20 2018

2018-03-11 00:36:22.503760+0800 TOCNSArraya[62051:14140071] The date is Sun Mar 11 00:36:22 2018

2018-03-11 00:36:22.503798+0800 TOCNSArraya[62051:14140071] The second date is Sun Mar 11 00:36:18 2018

2018-03-11 00:36:22.503811+0800 TOCNSArraya[62051:14140071] The second date is Sun Mar 11 00:36:20 2018

2018-03-11 00:36:22.503823+0800 TOCNSArraya[62051:14140071] The second date is Sun Mar 11 00:36:22 2018

2018-03-11 00:36:22.504032+0800 TOCNSArraya[62051:14140071] My Array C is : (

"2018-03-10 16:36:22 +0000",

"2018-03-11 16:36:22 +0000"

)

2018-03-11 00:36:22.504102+0800 TOCNSArraya[62051:14140071] The Array C is : Sat Mar 10 00:36:22 2018

2018-03-11 00:36:22.504122+0800 TOCNSArraya[62051:14140071] The Array C is : Sun Mar 11 00:36:22 2018

2018-03-11 00:36:22.504180+0800 TOCNSArraya[62051:14140071] The Array C is : Mon Mar 12 00:36:22 2018

2018-03-11 00:36:22.504330+0800 TOCNSArraya[62051:14140071] The Array C has updated to : (

"2018-03-10 16:36:22 +0000",

"2018-03-11 16:36:22 +0000"

)

Program ended with exit code: 0