OC基础语法
//整型
NSIntegera =10;
//NSLog是OC里面的打印函数
NSLog(@"a = %ld",a);
//浮点型
CGFloatb =2.3;
NSLog(@"b = %.2f",b);
//布尔类型
BOOLflag =YES;
//字符串NSString(只要是对象类型，占符全部都是%@)
NSString*str =@"abcde";
NSLog(@"str = %@",str);
//length字符串的长度
NSLog(@"str的长度= %ld",str.length);
//字符串相等（全等，前缀，后缀）
//1，全等
if([strisEqualToString:@"abcde"]){
NSLog(@"是的");
}
//2,前缀相等
if([strhasPrefix:@"a"]){
NSLog(@"前缀等于a");
}
//3,后缀相等
if([strhasSuffix:@"de"]){
NSLog(@"后缀等于de");
}
//格式化创建字符串
NSString*str1 = [NSString stringWithFormat:@"im"];
NSLog(@"str = %@",str1);
//数组（NSArry/NSMutableArry）
//不可变数组
NSArray*array1 =@[@"a",@"b",@"c",@"d"];
NSLog(@"array1 = %@",array1);
//数组元素个数.count
NSLog(@"count = %ld",array1.count);
//通过下标访问数组里面的元素
NSString*str = array1[0];
NSLog(@"str = %@",str);
//可变数组NSMutableArray
NSMutableArray*mutableArray = [NSMutableArrayarrayWithObjects:@"1",@"2",@"3",@"4",nil];
NSLog(@"mutableArray = %@",mutableArray);
//添加
[mutableArrayaddObject:@"5"];
NSLog(@"已添加-----%@",mutableArray);
//移除
[mutableArrayremoveObject:@"3"];
NSLog(@"已移除-----%@"，mutableArray)；
//字典(存放)（NSDictionary,NSMutableDictionary）
//不可变字典NSDictionary
NSDictionary*dict =@{@"key1":@"value1",@"key2":@"value2",@"key3":@"value3"};
NSLog(@"dict = %@",dict);
NSString*string =[dictobjectForKey:@"key1"];
NSLog(@"string = %@",string);
//所有的key值，所有的value值
NSLog(@"allValue = %@,allValue = %@",dict.allKeys,dict.allValues);
//调用方法用空格，方法调用结束用括号表示
[self func1];
NSIntegernum = [self func2];
NSLog(@"num = %ld",num);
NSIntegerlength = [selflengOfstring:@"12345"];
NSLog(@"length = %ld",length);
//+表示类方法，只能用类来调用，-表示实例方法，用对象调用
//无参数输入的方法格式：+/-(方法的返回值）方法名
- (void)func1
{
NSLog(@"%s",__func__);
}
-(NSInteger)func2{
NSLog(@"%s",__func__);
return20;
}
//有参数输入的方法格式：=+/-（方法的返回值）方法名：(参数1类型)参数1名方法名：（参数2类型）参数2名
//输入字符串，返回字符串长度
-(NSInteger)lengOfstring:(NSString*)string
{
returnstring.length;
}
//内存溢出的时候调用
- (void)didReceiveMemoryWarning {
[superdidReceiveMemoryWarning];
}
//按钮UIButton (UIButton *button =[UIButton buttonWithType:UIButtonTypeInfoDark];
)
//frame表明了控件的坐标和宽高（CGRect类型）
UIButton*button = [[UIButtonalloc]initWithFrame:CGRectMake(20(x),50(y),80(宽),80(高))];
[button setTitle:@"火影" forState:UIControlStateNormal];
//根据名字加载图片
UIImage*image = [UIImageimageNamed:@"left_normal"];
//给按钮设置背景图片（forState表明按钮状态）
[buttonsetBackgroundImage:ImageforState:(UIControlStateNormal)];
//给按钮设置背景图片颜色
button.backgroundColor = [UIColor redColor];
//按钮的监听
[buttonaddTarget:selfaction:@selector(btnClickLister)forControlEvents:UIControlEventTouchUpInside];
//添加按钮到视图上面
[self.viewaddSubview:button];
//相框UIImageView
UIImageView*imageview = [[UIImageViewalloc]initWithFrame:CGRectMake(150(x),50(y),200(宽),200(高))];
UIImage*image1 = [UIImageimageNamed:@"biaoqingdi"];
//设置imageView显示的图片
imageview.image= image1;
[self.viewaddSubview:imageview];
//标签UILabel
UILabel*label = [[UILabelalloc]initWithFrame:CGRectMake(150(x),270(y),150(宽),30(高))];
//设置标签文本
label.text=@"XUANG";
//设置居中方式
label.textAlignment=NSTextAlignmentCenter;
//设置标签文本颜色
label.textColor= [UIColorredColor];
//添加标签到视图上面
[self.viewaddSubview:label];}