###Foundation ######NSSting
void test2(){
NSLog(@"to upper is %@",[@"Hello world!" uppercaseString]);//转换成全部大写字母
NSLog(@"to upper is %@",[@"Hello world!" lowercaseString]);//全部转换成小写字母
NSLog(@"to upper is %@",[@"Hello world!" capitalizedString]);//第一个字母大写，其他小写
BOOL result = [@"abc" isEqualToString:@"aBc"];
NSLog(@"hehe%i",result);
NSComparisonResult result2 = [@"abc" isEqualToString:@"aBC"];//如果是[@"abc" caseInsensitiveCompare:@"aBc"]则忽略大小写比较
if (result2 == NSOrderedAscending) {
NSLog(@"left<right");
}else if (result2 == NSOrderedDescending){
NSLog(@"right>left");
}else if (result2 == NSOrderedSame){
NSLog(@"right=left");
}
}
void test3(){
NSLog(@"has prefix ab? %i",[@"abcdef" hasPrefix:@"ab"]);//是否以ab开头
//结果：has prefix ab? 1
NSLog(@"has suffix ab? %i",[@"abcdef" hasSuffix:@"ef"]);//是否以ef结尾
NSRange range = [@"abcdefgabef" rangeOfString:@"cde"];
if (range.location == NSNotFound) {
NSLog(@"没有找到");
}else{
NSLog(@"range is %@",NSStringFromRange(range));//是个结构体，一个是从0开始的索引，另一个是长度
}
}
void test4(){
NSLog(@"%@",[@"abcdef" substringFromIndex:3]);//从第三个索引开始截取
NSLog(@"%@",[@"abcdef" substringToIndex:3]);//从0开始截取到第三个索引
NSLog(@"%@",[@"abcdef" substringWithRange:NSMakeRange(2, 3)]);//在这range范围之内截取
NSString *str1 = @"12.abcd.3a.";
NSArray *array1 = [str1 componentsSeparatedByString:@"."];//字符串分割
NSLog(@"%@",array1);
}
void test5(){
NSLog(@"%li",(long)[@"12" integerValue]);
NSLog(@"%zi",[@"hello world,世界你好" length]);
NSLog(@"%c",[@"abc" characterAtIndex:0]);//取出指定位置的字符
const char *s = [@"abc" UTF8String];
NSLog(@"%s",s);
}
######NSArray
void test7(){
NSString *path = @"Users/renyufei/Desktop/test.txt";
NSLog(@"path%@",[path pathExtension]);//取得扩展名，注意ObjC中扩展名不包括"."
NSLog(@"%@",[path stringByDeletingPathExtension]);//删除扩展名
NSLog(@"%@",[path stringByAppendingPathExtension:@"mp3"]);
}
void test8(){
NSObject *obj = [[NSObject alloc]init];
NSArray *array= [NSArray arrayWithObjects:@"abc",obj,@"cde",@"opq",@25, nil];
NSLog(@"长度%zi",array.count);
NSLog(@"%i",[array containsObject:@"cde"]);//判断是否包含某个对象，返回的是BOOL值
NSLog(@"%@",[array lastObject]);
NSLog(@"%lu",(unsigned long)[array indexOfObject:@"cde"]);//对象所在的位置
// [array enumerateObjectsUsingBlock:^(id _Nonnull obj, NSUInteger idx, BOOL * _Nonnull stop) {
// NSLog(@"%@",obj);
// }];
NSEnumerator *enumeratop = [array reverseObjectEnumerator];
id obj2 = nil;
while (obj2 = [enumeratop nextObject]) {
NSLog(@"嘿嘿%@",obj2);
}//可以把数组逆序输出
NSLog(@"新书租%@",[array subarrayWithRange:NSMakeRange(1, 3)]);//根据一定范围获得一个新的数组
NSLog(@"%@",[array componentsJoinedByString:@","]);//把数组连起来并且形成一个字符串
NSString *path = @"/Users/renyufei/Desktop/array.xml";
[array writeToFile:path atomically:YES];
NSArray *array3 = [NSArray arrayWithContentsOfFile:path];
NSLog(@"321123%@",array3);
}
void test9(){
NSArray *array = [NSArray arrayWithObjects:@"3",@"1",@"2",@"6",@"0", nil];
NSArray *array1 = [array sortedArrayUsingSelector:@selector(compare:)];//从小到大进行排序
NSLog(@"hahah%@",array1);
}
void test10(){
NSMutableArray *array1 = [NSMutableArray arrayWithObjects:@"1",@"3",@"2", nil];
NSArray *array2 = [array1 sortedArrayUsingSelector:@selector(compare:)];
NSLog(@"哈哈哈%@",array2);
[array1 sortUsingSelector:@selector(compare:)];//从小到大排序，而且会改变array1的排序。在不可变数组中无论对数组怎么排序，原来的数组顺序都不会改变，但是在可变数组中如果使用sortUsingSelector:排序原来的数组顺序就发生了变化。
NSLog(@"array1是什么%@",array1);
}
void test11(){
NSDictionary *dict1 = [NSDictionary dictionaryWithObjects:[NSArray arrayWithObjects:@"1",@"2", nil] forKeys:[NSArray arrayWithObjects:@"a",@"b", nil]];
NSLog(@"字典是什么%@",dict1);
NSLog(@"%@",[dict1 objectsForKeys:[NSArray arrayWithObjects:@"a",@"e", nil] notFoundMarker:@"not found"]);
NSMutableDictionary *dic = [NSMutableDictionary dictionaryWithObjectsAndKeys:@"1",@"a",
@"2",@"b",
@"3",@"c",
@"2",@"d",
nil];
[dic removeObjectForKey:@"b"];
[dic addEntriesFromDictionary:@{@"e":@"7",@"f":@"6"}];
}
void test12(){
NSNumber *number1 = [NSNumber numberWithChar:'a'];
NSArray *array1 = [NSArray arrayWithObject:number1];
NSLog(@"是什么呢%@",array1);
NSNumber *number2 = [array1 lastObject];
NSLog(@"嘿嘿%@",number2);
char char1 = [number2 charValue];
NSLog(@"char1是什么%c",char1);
}
void test13(){
CGPoint point1 = CGPointMake(10, 20);
NSValue *value1 = [NSValue valueWithPoint:point1];
NSArray *array1 = [NSArray arrayWithObject:value1];
NSLog(@"数组1是什么%@",array1);
NSValue *value2 = [array1 lastObject];
CGPoint point2 = [value2 pointValue];
NSLog(@"x=%f,y=%f",point2.x,point2.y);
}
void test6(){
NSMutableArray *array = [NSMutableArray array];
[array addObject:@"/Users"];
[array addObject:@"Kenshincui"];
[array addObject:@"Desktop"];
NSString *path = [NSString pathWithComponents:array];//把数组里面的内容拼接成一个字符串
NSLog(@"哈哈%@",[path pathComponents]);//把字符串组成数组
NSLog(@"%i",[path isAbsolutePath]);//是否是绝对路径（其实就是看字符串是否以“/”开头）
NSLog(@"%@",[path lastPathComponent]);//取得最后一个目录
NSLog(@"%@",[path stringByDeletingLastPathComponent]);//删除最后一个目录
NSLog(@"%@",[path stringByAppendingPathComponent:@"Documents"]);//拼接路径
}