ViewController和drawRect [英] ViewController and drawRect

问题描述

我有一个UIViewController，我想调用drawRect，所以我可以绘制视图，但没有任何反应。

I have a UIViewController and I would like it to call drawRect so i can draw on the view but nothing happens.

#import <UIKit/UIKit.h>

@interface ViewController : UIViewController {
...code...
}

@end

和实现

#import "ViewController.h"


@implementation ViewController

-(void) drawRect:(CGRect) rect {
draw a pony
}

- (void)viewDidLoad {
}

- (void)didReceiveMemoryWarning {
    // Releases the view if it doesn't have a superview.
    [super didReceiveMemoryWarning];

    // Release any cached data, images, etc that aren't in use.
}

- (void)viewDidUnload {
    [super viewDidUnload];
    // Release any retained subviews of the main view.
    // e.g. self.myOutlet = nil;
}


- (void)dealloc {
    [super dealloc];
}

@end

应用程序运行时的视图，我做错了什么？

But no pony gets drawn on the view when the app is run, what do i do wrong?

推荐答案

UIViewController 没有覆盖消息 drawRect 。
您应该创建自 UIView 派生的自定义类，并覆盖 drawRect 。

The UIViewController don't have overridden message drawRect. You should create custom class derived from UIView and override message drawRect there.

您可以为 UIViewController 覆盖（UIView *）视图 UIView 或在Interface Builder中将类从 UIView 更改为自己的类。

You can override message (UIView *)view for UIViewController and return own custom UIView or in Interface Builder change class from UIView to own class.

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