Iphone 从另一个类调用一个类

在iphonesdk中，如何从另一个类调用一个类

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我需要访问这个background.m类

-(void)brightness
{
    UIButton *button = [UIButton buttonWithType:UIButtonTypeCustom];
    UIImage *image = [UIImage imageNamed:@"brightness.jpg"];
    button.frame = CGRectMake(0, 0, image.size.width, image.size.height);
    [button setImage:image forState:UIControlStateNormal];

    UIButton *button1 = [UIButton buttonWithType:UIButtonTypeCustom];
    UIImage *image1 = [UIImage imageNamed:@"brightness.jpg"];
    button1.frame = CGRectMake(0, 0, image1.size.width, image1.size.height);
    [button1 setImage:image forState:UIControlStateNormal];
    [button1 addTarget:self action:@selector(brightnessControl:) forControlEvents:UIControlEventTouchUpInside];

    gBrightnessSetting=100;
    brightnessOverlay = [[CALayer alloc] retain];
    brightnessOverlay.masksToBounds = YES;
    brightnessOverlay.backgroundColor = [[[UIColor blackColor] colorWithAlphaComponent:1.0] CGColor];
    brightnessOverlay.opacity = 0.0;
    [self.layer addSublayer:brightnessOverlay];

    bottomButtonsSize = SCREENWIDTH/5;

}
- (void)dealloc {
    [brightnessLessButton release];
    [brightnessMoreButton release];

    [super dealloc];
}

- (void) setLayerFrames {
    brightnessOverlay.frame = CGRectMake(self.layer.bounds.origin.x,self.layer.bounds.origin.y,self.bounds.size.width,self.layer.bounds.size.height);
}

In ebook.m class,

- (void)tableView:(UITableView *)tableView didSelectRowAtIndexPath:(NSIndexPath *)indexPath {

   if ([indexPath row]==0) {
       background *back=[[background alloc] init];
       [back brightness];

    }

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在Objective-C中，在实例上调用的方法以

-

开头，而在类上调用的方法以

+

开头

例如，如果要调用构造函数方法，如NSArray中的

+（NSArray*）arrayWithArray:（NSArray*）array

：

NSArray *firstArray = [[NSArray alloc] init];
NSArray *duplicateArray = [NSArray arrayWithArray:firstArray];
[duplicateArray retain];

---

您可能还注意到

alloc

方法以

+

开头，因为它是调用类而不是实例。

因为对象方法调用对象方法，所以您的问题有点难以回答。你能提供一些代码示例来说明你的意思吗？我需要访问这个背景类，不。你需要访问那个类的一个对象。不是类本身。这是正确的，初始化方法也是如此