//NSRange的使用    NSRange r1 = NSMakeRange(2, 4);  //第一个参数为.location 第二个参数为.length        NSString *str = @"学习OC";        NSRange range = [str rangeOfString:@"学习"];  //查找某个字符串在str字符串中的位置和长度        NSLog(@"loc = %ld, len = %ld",range.location, range.length);        NSRange range1 = [str rangeOfString:@"找不到"];  //查找某个字符串在str字符串中的位置和长度        NSLog(@"loc = %d, len = %ld",range1.location, range1.length);  //如果找不到，location 的返回值为-1,要用%d输出location 的值才会有负号，默认的%ld是没有符号              //CGPoint的使用    CGPoint point1 = NSMakePoint(10, 10);    NSPoint point2 = CGPointMake(10, 10); //平常经常使用这种方法定义一个CGPoint 对象            //NSSzie的使用    NSSize size1 = CGSizeMake(10, 20);    CGSize size2 = NSMakeSize(10, 20);            //CGRect 的使用    CGRect rect1 = CGRectMake(0, 0, 50, 50);    CGRect rect2 = {point1, size1};            //打印结构体的方法    NSString *s = NSStringFromPoint(point1);    NSLog(@"%@",s);        NSString *s1 = NSStringFromRect(rect1);    NSLog(@"%@",s1);

//判断结构体NSPoint\CGPoint、NSSize\CGSize、 NSRect\CGRect 包含的值是否相同的方法    CGPointEqualToPoint(point1, point2);    CGRectEqualToRect(rect1, rect2);    CGRectEqualToRect(rect1, rect2);        //判断某个rect是否包含某个点,必须引用框架CoreGraphic.framework,这样才能调用 CGRectContainsPoint方法    BOOL b1 = CGRectContainsPoint(rect1, point1);    NSLog(@"%d",b1);    return 0;

    //创建字符串    NSString *s1 = @"test";    NSString *s2 = [[NSString alloc]initWithFormat:@"test is %c",‘c‘];        //此方法可以将c语言字符串转化为OC字符串    NSString *s3 = [[NSString alloc]initWithUTF8String:"name"];        //OC字符串转化为C语言字符串    const char *cs = [s3 UTF8String];        NSString *s4 = [[NSString alloc] initWithContentsOfFile:@"/Users/lpmac/Desktop/my.text" encoding:NSUTF8StringEncoding error:nil];    [NSString stringWithContentsOfFile:@"/Users/lpmac/Desktop/my.text" encoding:NSUTF8StringEncoding error:nil];                NSURL *url = [[NSURL alloc]initWithString:@"file:///Users/lpmac/Desktop/my.text"];    //类方法    [NSURL URLWithString:@"file:///Users/lpmac/Desktop/my.text"];    NSString *s5 = [[NSString alloc]initWithContentsOfURL:url encoding:NSUTF8StringEncoding error:nil];     //类方法    [NSString stringWithContentsOfFile:@"file:///Users/lpmac/Desktop/my.text" encoding:NSUTF8StringEncoding error:nil];    NSLog(@"%@",s5);

    NSMutableString * mutableString1 = [NSMutableString stringWithFormat:@"test"];    //拼接字符串    [mutableString1 appendString:@"append str"];        //删除    NSRange range = [mutableString1 rangeOfString:@"test"];    [mutableString1 deleteCharactersInRange:range];    NSLog(@"%@",mutableString1);

      //数组的创建    NSArray *array = [NSArray arrayWithObject:@"test"];    NSArray *array1 = [NSArray arrayWithObjects:@"test1",@"test2",@"test2",nil];    NSArray *array2 = @[@"test1",@"test2",@"test2"]; //提倡快速写法        //数组访问    [array1 objectAtIndex:0];    array1[0]; //提倡        //数组的遍历    for (int i=0; i<array.count; i++) {        NSLog(@"%@",array[i]);    }

    //快速遍历     for (id obj in array2) {                NSUInteger loc = [array2 indexOfObject:obj];         NSLog(@"%@,%ld",obj,loc);           }            [array2 enumerateObjectsUsingBlock:^(id obj, NSUInteger idx, BOOL *stop) {          NSLog(@"%@,%ld",obj,idx);        if (idx == 1) {            *stop = YES;        }    }];