在這裡我要說一下，ios開發的知識點都偏於基礎，我只記錄了一些基礎的知識點，並進行了擴充套件，適合入門的朋友：
【IOS初學者】UITableView與自定義UITableViewCell
【IOS初學者】bundle知識點總結
【IOS開發初學者】UINavigationController詳解
NSArray
初始化
//1)建立一個空陣列
NSArray *arr1 = [NSArray array];
//建立陣列,只有一個元素
NSArray *arr2 = [NSArray arrayWithObject:@"aaa"];
//建立陣列,有多個元素
// nil 表示陣列賦值結束
NSArray *arr3 = [NSArray arrayWithObjects:@"aaa",@"bbb", nil];
//呼叫物件方法,建立陣列
NSArray *arr4 = [[NSArray alloc] initWithObjects:@"aaa",@"bbb", nil];
//用一個陣列可以建立另外一個陣列
NSArray *arr5 = [NSArray arrayWithArray:arr3];
//使用@
NSArray *arr6 = @[@"aaa",@"bbb",@"ccc",@"ddd"];複製程式碼常用方法
//獲取陣列的長度
NSLog(@"%ld",arr3.count);
//根據下標,獲取下標對應的物件
NSLog(@"%@",[arr3 objectAtIndex:1]);
NSLog(@"%@",arr3[1]);
//返回元素的下標
NSUInteger loc = [arr3 indexOfObject:@"bbb"];
NSLog(@"%ld",loc);
//陣列中是否包含了某個元素
if([arr3 containsObject:@"gggg"]){
NSLog(@"包含此元素");
}else{
NSLog(@"不包含");
}
NSLog(@"arr5 = %@",arr5);複製程式碼對應log：
2017-02-24 09:35:12.836 TestArray[7023:601929] 2
2017-02-24 09:35:12.837 TestArray[7023:601929] bbb
2017-02-24 09:35:12.837 TestArray[7023:601929] bbb
2017-02-24 09:35:12.837 TestArray[7023:601929] 1
2017-02-24 09:35:12.837 TestArray[7023:601929] 不包含
2017-02-24 09:35:12.837 TestArray[7023:601929] arr5 = (
aaa,
bbb
)複製程式碼遍歷
//普通的方式,通過下標訪問
for (int i=0; i<arr3.count; i++) {
NSLog(@"-> %@",arr3[i]);
}
// 快速列舉法 for迴圈的增強形式
for (NSString * str in arr3) {
NSLog(@"---> %@",str);
}
//使用block的方式,進行訪問
[arr3 enumerateObjectsUsingBlock:^(id obj, NSUInteger idx, BOOL *stop) {
if(idx == 2){
*stop = YES; //停止
}else{
NSLog(@"idx = %ld,obj = %@",idx,obj);
}
}];複製程式碼列印log如下：
2017-02-24 09:46:33.215 TestArray[7047:609202] -> aaa
2017-02-24 09:46:33.215 TestArray[7047:609202] -> bbb
2017-02-24 09:46:33.215 TestArray[7047:609202] ---> aaa
2017-02-24 09:46:33.215 TestArray[7047:609202] ---> bbb
2017-02-24 09:46:33.215 TestArray[7047:609202] idx = 0,obj = aaa
2017-02-24 09:46:33.215 TestArray[7047:609202] idx = 1,obj = bbb
Program ended with exit code: 0複製程式碼讀寫
- 寫
NSArray *array = [NSArray arrayWithObjects:@"one",@"zbz",@"cgx",@"sb",@"cjk",@"senni", nil];
BOOL isWrite = [array writeToFile:@"/Users/xxxx/Desktop/arr.xml" atomically:YES];複製程式碼- 讀
NSArray *readArr = [NSArray arrayWithContentsOfFile:@"/Users/xxxx/Desktop/arr.xml"];複製程式碼NSArray與字串
- 陣列拼接字串
NSArray *arr6 = @[@"aaa",@"bbb",@"ccc",@"ddd"];
NSString *str = [arr6 componentsJoinedByString:@"-"];
NSLog(@"str = %@",str);複製程式碼- 字串拆分為陣列
NSArray *arr7 = [str componentsSeparatedByString:@"-"];
NSLog(@"%@",[arr7 firstObject]);
NSLog(@"%@",[arr7 lastObject]);
NSLog(@"%@",arr7[1]);複製程式碼看下列印log：
2017-02-24 09:58:04.852 TestArray[7107:619117] str = aaa-bbb-ccc-ddd
2017-02-24 09:58:04.852 TestArray[7107:619117] aaa
2017-02-24 09:58:04.853 TestArray[7107:619117] ddd
2017-02-24 09:58:04.853 TestArray[7107:619117] bbb
Program ended with exit code: 0複製程式碼NSMutableArray
初始化
NSMutableArray *arr1 = [NSMutableArray array];
//建立的時候初始化一個元素
NSMutableArray *arr2 = [NSMutableArray arrayWithObject:@"aaa"];
//建立陣列的時候,初始化多個元素
NSMutableArray *arr3 = [NSMutableArray arrayWithObjects:@"bbb",@"ccc",@"ddd",nil];
//建立一個陣列,並且指定長度,
NSMutableArray *arr4 = [NSMutableArray arrayWithCapacity:5];複製程式碼操作
新增
[arr1 addObject:@"ccc"]; [arr1 insertObject:@"ddd" atIndex:0];複製程式碼刪除
/刪除指定元素 [arr1 removeObject:@"aaa"]; //根據角標刪除元素 [arr1 removeObjectAtIndex:1]; //刪除所有元素 [arr1 removeAllObjects];複製程式碼修改
[arr3 replaceObjectAtIndex:1 withObject:@"aaa"]; arr3[1] = @"ccc";複製程式碼- 查詢
BOOL isSearch = [arr3 containsObject:@"ddd"]; NSLog(@"%d",isSearch);複製程式碼 - 交換
NSMutableArray *arr5 =[NSMutableArray arrayWithObjects:@1,@2,@3,@4,@5, nil]; [arr5 exchangeObjectAtIndex:0 withObjectAtIndex:4]; NSLog(@"%@",arr5);複製程式碼遍歷
NSMutableArray的遍歷可以使用NSArray的方式進行遍歷
NSDictionary
建立
NSDictionary *dict = [NSDictionary dictionaryWithObjectsAndKeys:@"lnj", @"name", @"12345678", @"phone", @"天朝", @"address", nil];
NSDictionary *dict = @{@"name":@"lnj", @"phone":@"12345678", @"address":@"天朝"};複製程式碼獲取元素
[dict objectForKey:@"name”];
dict[@"name”];複製程式碼遍歷
NSDictionary *dict = @{@"name":@"lnj", @"phone":@"12345678", @"address":@"天朝"};
for (NSString *key in dict) {
NSLog(@"key = %@, value = %@", key, dict[key]);
}複製程式碼或
[dict enumerateKeysAndObjectsUsingBlock:^(NSString *key, NSString *obj, BOOL *stop) {
NSLog(@"key = %@, value = %@", key, obj);
}];複製程式碼讀寫
- 讀
NSDictionary *newDict = [NSDictionary dictionaryWithContentsOfFile:@"/Users/LNJ/Desktop/dict.plist"]; NSLog(@"newDict = %@", newDict);複製程式碼 - 寫
NSDictionary *dict = @{@"name":@"lnj", @"phone":@"12345678", @"address":@"天朝"}; BOOL flag = [dict writeToFile:@"/Users/LNJ/Desktop/dict.plist" atomically:YES]; NSLog(@"flag = %i", flag);複製程式碼
NSMutableDictionary
初始化
NSMutableDictionary *dic2 = [NSMutableDictionary dictionaryWithObjectsAndKeys:@"v1",@"key1",@"v2",@"key2",nil];
NSMutableDictionary *dict1 = [NSMutableDictionary dictionary];
NSMutableDictionary *dict2 = [NSMutableDictionary dictionaryWithCapacity:3];複製程式碼新增元素
[dic2 addEntriesFromDictionary:dic3];
[dic2 setValue:@"value3" forKey:@"key3"];複製程式碼刪除元素
//刪除指定key
[dic1 removeObjectForKey@"key1"];
//刪除指定key陣列
NSArray *array = [NSArray arrayWithObjects:@"key1", nil];
[dic2 removeObjectsForKeys:array];
//移除字典所有物件
[dic1 removeAllObjects];複製程式碼修改元素
[dict1 setObject:@"zhaosi" forKey:@"ls"];
//簡寫形式
dict1[@"ls"] = @"xxxxx";
NSLog(@"%@",dict1);複製程式碼遍歷
NSMutableDictionary *dictionary3 = [NSMutableDictionary dictionaryWithObjectsAndKeys:@"value",@"key",@"value2",@"key2",@"value3",@"key3",@"value4",@"key4",@"value5",@"key5",@"value6",@"key6", nil];
for (id key in dictionary3) {
id obj = [dictionary3 objectForKey:key];
NSLog(@"快速列舉--->obj= %@",obj);
}
//一般列舉
NSArray *keys = [dictionary3 allKeys];
float length = [keys count];
for (int i = 0; i < length; i ++) {
id key = [keys objectAtIndex:i];
id obj = [dictionary3 objectForKey:key];
NSLog(@"一般列舉--->%@",obj);
}
//通過列舉類列舉
NSEnumerator *enumerator3 = [dictionary3 keyEnumerator];
id key = [enumerator3 nextObject];
while (key) {
id obj = [dictionary3 objectForKey:key];
NSLog(@"通過列舉類列舉--->%@",obj);
key = [enumerator3 nextObject];
}複製程式碼