框架指objective-c的foundation库，下面的例子中给出几个常见用的类及其方法。
- 数值对象
NSNumber *intNum;
NSNumber *longNum;
NSNumber *floatNum; intNum = [NSNumber numberWithInteger:];
NSLog(@"%i", [intNum integerValue]); longNum = [NSNumber numberWithLong:0x123456];
NSLog(@"%lx", [longNum longLongValue]); floatNum = [NSNumber numberWithFloat:12.00];
NSLog(@"%f", [floatNum floatValue]); if([intNum isEqualToNumber:floatNum] == YES){
NSLog(@"eqaul"); //相同
}else{
NSLog(@"not equal");
}
- 字符串
NSString *str1 = @"hello,world";
NSString *str2 = [NSString stringWithFormat:@"%i,%@", , @"fredric"];
NSLog(@"%@%@", str1,str2);
NSLog([str1 stringByAppendingString:str2]); NSMutableString *str3 = [NSMutableString stringWithString:@"hello"];
[str3 appendString:@"fredric_"];
[str3 insertString:@"word" atIndex:str3.length];
NSLog(@"%@",str3); //hellofredric_word NSRange res = [str3 rangeOfString:@"ric"];
if(res.location != NSNotFound){
[str3 deleteCharactersInRange:res];
} NSLog(@"%@",str3); //hellofred_word
- 数组
NSArray *array = [NSArray arrayWithObjects:@"demo1",@"demo2",@"demo3", nil];
for(int i = ; i < [array count]; i++){
NSLog(@"%@",[array objectAtIndex:i]);
}
NSMutableArray *mArray = [NSMutableArray arrayWithCapacity:];
[mArray addObject:@"demo4"];
[mArray addObject:@"demo5"];
[mArray addObject:@"demo6"];
for(int i = ; i < [mArray count]; i++){
NSLog(@"%@",[mArray objectAtIndex:i]);
}
- 字典
NSDictionary *dic = [NSDictionary dictionaryWithObjectsAndKeys:@"value1",@"key1",@"value2",@"key2",@"valu3", @"key3", nil];
NSString *value1 = [dic objectForKey:@"key1"];
NSLog(@"%@", value1); NSMutableDictionary *mDic = [[NSMutableDictionary alloc]init];
[mDic setObject:@"value1_1" forKey:@"key1"];
NSLog(@"%@", [mDic objectForKey:@"key1"]);