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OC 第七天 容器类 lesson7
NSArray 常用方法
1.创建数组对象，使用初始化方法或便利构造器。
<span style="font-size:18px;"> NSArray *arr1 = [[NSArray alloc]initWithObjects:@"王晨",@"刘国伟",@"郑海坤",nil];
NSArray *arr2 = [NSArray arrayWithObjects:@"李智",@"魏大卫",@"刘天伟", nil];
NSArray *arr3 = [NSArray arrayWithArray:arr1];
NSLog(@"%@\n%@\n%@\n", arr1, arr2, arr3);</span>运行结果：
2014-09-19 19:29:06.750 oc07_容器类[5676:303] (
"\U738b\U6668",
"\U5218\U56fd\U4f1f",
"\U90d1\U6d77\U5764"
)
(
"\U674e\U667a",
"\U9b4f\U5927\U536b",
"\U5218\U5929\U4f1f"
)
(
"\U738b\U6668",
"\U5218\U56fd\U4f1f",
"\U90d1\U6d77\U5764"
)
2.获取元素个数。
<span style="font-size:18px;"><span style="white-space:pre"> </span>for (int i = 0; i < [arr1 count]; i++) {</span>3.根据索引值获取对象。
<span style="font-size:18px;"> NSLog(@"%@",[arr1 objectAtIndex:i]);
NSLog(@"%@", arr1[i]);
}</span>运行结果：2014-09-19 19:29:06.752 oc07_容器类[5676:303]王晨
2014-09-19 19:29:06.752 oc07_容器类[5676:303]王晨
2014-09-19 19:29:06.752 oc07_容器类[5676:303]刘国伟
2014-09-19 19:29:06.753 oc07_容器类[5676:303]刘国伟
2014-09-19 19:29:06.753 oc07_容器类[5676:303]郑海坤
2014-09-19 19:29:06.754 oc07_容器类[5676:303]郑海坤
4.获取某对象在数组中的索引值。
<span style="font-size:18px;"><span style="white-space:pre"> </span>NSLog(@"%lu",[arr1 indexOfObject:@"王晨"]);</span>运行结果：
2014-09-19 19:29:06.754 oc07_容器类[5676:303] 0
NSMutableArray 常用方法
1.创建数组对象。
<span style="font-size:18px;"><span style="white-space:pre"> </span>NSMutableArray * mutArry1 = [NSMutableArray arrayWithArray:arr1];</span>2.添加元素、插入元素。
<span style="font-size:18px;"> [mutArry1 addObject:@"陈佳鸿"];//添加
[mutArry1 addObjectsFromArray:arr2];
NSString *temp = @"woca";
[mutArry1 insertObject:temp atIndex:4];//插入
for (int i = 0; i < [mutArry1 count]; i++) {
NSLog(@"%@",mutArry1[i]);
}</span>运行结果：2014-09-19 20:23:31.004 oc07_容器类[6755:303]王晨
2014-09-19 20:23:31.004 oc07_容器类[6755:303]刘国伟
2014-09-19 20:23:31.005 oc07_容器类[6755:303]郑海坤
2014-09-19 20:23:31.005 oc07_容器类[6755:303]陈佳鸿
2014-09-19 20:23:31.005 oc07_容器类[6755:303] woca
2014-09-19 20:23:31.006 oc07_容器类[6755:303]李智
2014-09-19 20:23:31.006 oc07_容器类[6755:303]魏大卫
2014-09-19 20:23:31.007 oc07_容器类[6755:303]刘天伟
数组的嵌套遍历：<span style="font-size:18px;"> NSMutableArray *class19 = [NSMutableArray arrayWithObjects:arr1, arr2, arr3 ,nil];
//方法1
for (int i = 0; i < [class19 count]; i++) {
for (int j = 9; j < [class19[i] count]; j++) {
NSLog(@"%@",class19[i][j]);
}
}
//方法2
for (int i = 0; i < [class19 count]; i++) {
for (int j = 0; j < [[class19 objectAtIndex:i] count]; j++) {
NSLog(@"%@",[[class19 objectAtIndex:i]objectAtIndex:j]);
}
}
//方法3
for (int i = 0; i < [class19 count]; i++) {
NSArray *arr = [class19 objectAtIndex:i];
for (int j = 0; j < [arr count]; j++) {
NSLog(@"%@",arr[j]);
}
}</span>3.删除元素、替换元素。
<span style="font-size:18px;"> [mutArry1 removeLastObject];
[mutArry1 removeObject:@"刘天伟"];
// 替换
[mutArry1 replaceObjectAtIndex:5 withObject:@"王子洁"];
for (int i = 0; i < [mutArry1 count]; i++) {
NSLog(@"%@",mutArry1[i]);
}</span>运行结果：
2014-09-19 20:28:01.038 oc07_容器类[6782:303]王晨
2014-09-19 20:28:01.038 oc07_容器类[6782:303]刘国伟
2014-09-19 20:28:01.039 oc07_容器类[6782:303]郑海坤
2014-09-19 20:28:01.039 oc07_容器类[6782:303]陈佳鸿
2014-09-19 20:28:01.039 oc07_容器类[6782:303] woca
2014-09-19 20:28:01.040 oc07_容器类[6782:303]王子洁
2014-09-19 20:28:01.040 oc07_容器类[6782:303]魏大卫
4.交换指定位置的两个元素。
<span style="font-size:18px;"> [mutArry1 exchangeObjectAtIndex:4 withObjectAtIndex:5];
for (int i = 0; i < [mutArry1 count]; i++) {
NSLog(@"%@",mutArry1[i]);
}</span>关于排序：
<span style="font-size:18px;">NSMutableArray *aryNum = [NSMutableArray arrayWithObjects:@"3", @"7", @"9", @"1", @"5", nil];</span>
冒泡方法：
<span style="font-size:18px;"> int flag = 1;
for (int i = 0; i < [aryNum count ] - 1 && 1 == flag; i++) {
flag = 0;
for (int j = 0; j < [aryNum count] - i - 1; j++) {
if ([aryNum[j] compare: aryNum[j + 1]] == 1) {
[aryNum exchangeObjectAtIndex:j withObjectAtIndex:j + 1];
flag = 1;
}
}
}
for (int i = 0; i < [aryNum count]; i++) {
NSLog(@"%@",aryNum[i]);
}
</span><span style="font-size:18px;"> 1.可变数组的排序方法
[aryNum sortUsingSelector:@selector(compare:)];
2.不可变数组的排序方法
aryNum = (NSArray *)[aryNum sortedArrayUsingSelector:@selector(compare:)];</span>NSNumber 常用方法
<span style="font-size:18px;">//1.创建各个类型得数值对象
//(1)整型
NSNumber *n1 = [NSNumber numberWithInt:43];
//(2)浮点（单精度）
NSNumber *n2 = [NSNumber numberWithFloat:3.14];
//(3)浮点（双精度）
NSNumber *n3 = [NSNumber numberWithDouble:65.1131313123123123123];
//(4)长整型
NSNumber *n4 = [NSNumber numberWithLong:987654321];
//(5)字符型
NSNumber *n5 = [NSNumber numberWithChar:'A'];</span>NSMutableArray 常用方法
<span style="font-size:18px;"> NSMutableArray *arrNum = [NSMutableArray arrayWithObjects:n1, n2, n3, n4, n5, nil];
NSLog(@"%@",arrNum);</span>运行结果：2014-09-19 20:28:01.044 oc07_容器类[6782:303] (
43,
"3.14",
"65.11313131231232",
987654321,
65
)
对arrNum排序：
<span style="font-size:18px;"> [arrNum sortUsingSelector:@selector(compare:)];
NSLog(@"%@",arrNum);</span>运行结果：2014-09-19 20:28:01.045 oc07_容器类[6782:303] (
"3.14",
43,
65,
"65.11313131231232",
987654321
)
遍历arrNum
for (int i = 0; i < [arrNum count]; i++) {
double d = [arrNum[i] doubleValue];
NSLog(@"%.9f",d);
}运行结果：
2014-09-19 20:28:01.045 oc07_容器类[6782:303] 3.140000105
2014-09-19 20:28:01.045 oc07_容器类[6782:303] 43.000000000
2014-09-19 20:28:01.046 oc07_容器类[6782:303] 65.000000000
2014-09-19 20:28:01.046 oc07_容器类[6782:303] 65.113131312
2014-09-19 20:28:01.047 oc07_容器类[6782:303] 987654321.000000000
OC 第七天 容器类 lesson7