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2015.3.3
#import <Foundation/Foundation.h>
int main(int argc, const char * argv[]) {
@autoreleasepool {
//利用i值遍历数组
NSArray *array = [NSArray arrayWithObjects:@"one",@"two",@"three",@"four",@"five", nil];
//NSLog(@"array = %@", array);
#if 0
NSInteger len = [array count];
for (NSInteger i=0; i<len; i++) {
NSLog(@"%@", [array objectAtIndex:i]);
}
#endif
#if 0
//枚举器遍历数组
//正序枚举数组
NSEnumerator *enum1 = nil;
enum1 = [array objectEnumerator];
id obj = nil;//obj对象指针必须定义在循环外面
while (obj = [enum1 nextObject]) {
NSLog(@"%@", obj);
}
//倒序枚举数组
NSEnumerator *enum2 = [array reverseObjectEnumerator];
id obj2 = nil;
while (obj2 = [enum2 nextObject]) {
NSLog(@"%@", obj2);
}
#endif
//快速枚举法遍历数组
for (id obj in array) {
NSLog(@"%@", obj);
}
}
return 0;
}
#import <Foundation/Foundation.h>
int main(int argc, const char * argv[]) {
@autoreleasepool {
NSArray *array = @[@"one",@"two",@"three",@"four",@"five",@"six",@"seven"];
// array = [array sortedArrayUsingSelector:@selector(compare:)];
// NSLog(@"array = %@", array);
NSMutableArray *mulArray = [NSMutableArray arrayWithArray:array];
array = [mulArray sortedArrayUsingSelector:@selector(compare:)];
NSLog(@"array = %@", array);
}
return 0;
}
#import <Foundation/Foundation.h>
//NSDictionary
//创建不可变字典
//字典对象中的没有元素都是一个键值对
//key : vlaue
//key 与 vlaue可以为任意类型的对象
//通常 key 用字符串类的对象表示
int main(int argc, const char * argv[]) {
@autoreleasepool {
//xcode 4.6之后
//创建字典对象
NSDictionary *dict = @{@"one":@"1",@"two":@"2",@"three":@"3",@"four":@"4"};
NSLog(@"dict = %@", dict);
//- (instancetype)initWithObjectsAndKeys:(id)firstObject...
NSDictionary *dict1 = [NSDictionary dictionaryWithObjectsAndKeys:@"1",@"one",@"2",@"two",@"3",@"three", nil];
NSLog(@"dict1 = %@", dict1);
//用传入字典对象创建一个新的字典对象
//- (instancetype)initWithDictionary:(NSDictionary *)otherDictionary;
NSDictionary *dict2 = [NSDictionary dictionaryWithDictionary:dict1];
NSLog(@"dict2 = %@", dict2);
//用value的数组及key的数组创建字典对象
//- (instancetype)initWithObjects:(NSArray *)objects forKeys:(NSArray *)keys;
NSArray *values = @[@"1",@"2",@"3",@"4"];
NSArray *keys = @[@"one",@"two",@"three",@"four"];
NSDictionary *dict3 = [NSDictionary dictionaryWithObjects:values forKeys:keys];
NSLog(@"dict3 = %@", dict3);
//字典的其它操作方法
//获取字典对象键值对个数
NSInteger cnt = [dict count];
NSLog(@"cnt = %ld", cnt);
//通过key获取对应的值
id obj = [dict objectForKey:@"three"];
NSLog(@"obj = %@", obj);
//获取字典中所有的key
NSArray *allKeys = [dict allKeys];
NSLog(@"allKeys = %@", allKeys);
//通过值找到该值对应的所有的key
NSDictionary *dict4 = @{@"one":@"1", @"two":@"1",@"three":@"3",@"four":@"3"};
NSArray *keys1 = [dict4 allKeysForObject:@"1"];
NSLog(@"keys1 = %@", keys1);
//获取所有的值
NSArray *values1 = [dict4 allValues];
NSLog(@"values1 = %@", values1);
//判断两个字典是否相等
BOOL ret = [dict isEqualToDictionary:dict4];
NSLog(@"ret = %d", ret);
//字典遍历
//i值遍历
NSInteger len = [dict count];
NSArray *keys2 = [dict allKeys];
for (NSInteger i=0; i<len; i++) {
NSLog(@"key = %@ value = %@", [keys2 objectAtIndex:i], [dict objectForKey:[keys2 objectAtIndex:i]]);
}
//枚举器法
NSEnumerator *keyEnum = [dict keyEnumerator];
id keyObj = nil;
while (keyObj = [keyEnum nextObject]) {
NSLog(@"%@:%@",keyObj,[dict objectForKey:keyObj]);
}
//枚举值
NSEnumerator *valueEnum = [dict objectEnumerator];
id valueObj = nil;
while (valueObj = [valueEnum nextObject]) {
NSLog(@"%@", valueObj);
}
//快速枚举法
//枚举的是key而不是value, 但是可以通过key查找对应的值
for (id keyObj in dict) {
NSLog(@"%@:%@", keyObj,[dict objectForKey:keyObj]);
}
}
return 0;
}
#import <Foundation/Foundation.h>
//NSMutableDictionary
//创建可变字典对象
//继承与NSDictionary
int main(int argc, const char * argv[]) {
@autoreleasepool {
//创建一个空的字典对象
NSMutableDictionary *dict = [NSMutableDictionary dictionary];
NSMutableDictionary *mulDict = [NSMutableDictionary dictionaryWithObjectsAndKeys:@"1",@"one",@"2",@"two",@"3",@"three",@"4",@"four", nil];
NSLog(@"mulDict = %@", mulDict);
//通过key删除对应的键值对
[mulDict removeObjectForKey:@"four"];
NSLog(@"mulDict = %@", mulDict);
//创建一个指定容量的可变字典对象
NSMutableDictionary *mulDict1 = [NSMutableDictionary dictionaryWithCapacity:12];
//把传入的字典键值对添加到可变字典中
[mulDict1 addEntriesFromDictionary:mulDict ];
[mulDict1 addEntriesFromDictionary:@{@"five":@"5",@"six":@"6",@"one":@"2"}];
NSLog(@"mulDict1 = %@", mulDict1);
//key在字典中是唯一的
NSMutableDictionary *mulDict2 = [NSMutableDictionary dictionaryWithObjectsAndKeys:@"1",@"one",@"2",@"two",@"3",@"one", nil];
NSLog(@"mulDict2 = %@", mulDict2);
//删除所有的键值对
[mulDict2 removeAllObjects];
NSLog(@"mulDict2 = %@", mulDict2);
//利用key的数组, 删除key数组对应的键值对
NSArray *keyArray = @[@"one",@"two"];
[mulDict1 removeObjectsForKeys:keyArray];
NSLog(@"mulDict1 = %@", mulDict1);
//用传入的字典对象重置可变字典
[mulDict1 setDictionary:@{@"hello":@"1",@"world":@"2"}];
NSLog(@"mulDict1 = %@", mulDict1);
}
return 0;
}
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原文地址：http://www.cnblogs.com/-yun/p/OC_day4.html
