Question

ViewController上添加UIview在UIView中画图怎么实现

Answer 1

ViewController上添加UIview在UIView中画图怎么实现
1、在storyboard中拖入View－Represents a rectangular
2、在工程中新建file添加一个新的Cocoa Class，并选择Subclass of为UIView的子类，可以命名为MyView
3、回到storyboard中点击view在右边点击表识检查器（小方框的样子）[font=verdana, arial, helvetica, sans-serif ]将控制器的view属性（class）设为MyView
3、重写MyView的方法
4.在MyView.m下写
[font=verdana, arial, helvetica, sans-serif ]- (void)drawRect:(CGRect)rect方法就实现了画图。

Answer 2

直接把- (void)drawRect:(CGRect)myView方法写到ViewController.m下以下面这样吗，可是运行不出来
#import "ViewController.h"
@interface ViewController ()
@end
@implementation ViewController
- (void)viewDidLoad {
[super viewDidLoad];
// Do any additional setup after loading the view, typically from a nib.
CGRect rect = CGRectMake(380, 200, 300, 300);
UIView *myView= [[UIView alloc] initWithFrame:rect];
[myView setBackgroundColor:[UIColor grayColor]];
[self.view addSubview: myView];