ios - 如何动态更改 UIButton 标题文本

Question

- (void)viewDidLoad {
    [self addMyButton];   // Call add button method on view load
}

- (void)addMyButton {     // Method for creating button, with background image and other properties    
    UIButton *button = [UIButton buttonWithType:UIButtonTypeRoundedRect];
    [button addTarget:self action:@selector(aMethod)forControlEvents:UIControlEventTouchUpInside];
    [button setTitle:@"Show More" forState:UIControlStateNormal];
    button.frame = CGRectMake(80.0, 500.0, 160.0, 40.0);    
    [self.view addSubview:button];
}

- (void)aMethod {
    NSLog(@"in load more n===>>>%d",n);
    [tbl reloadData];    
}

有一个 NSMutableArray 包含三十个对象。首先应该只显示 10 个对象，点击“显示更多”按钮后会显示 20 个对象，第二次点击按钮后会显示 30 个对象，按钮标题将变为“返回”。当我点击“返回”时，表格 View 应该再次只显示二十个对象。下一次单击后应显示十个元素。

Answer 1

-(void) aMethod{
if(n==2)
{
    [button setTitle:@"Return" forState:UIControlStateNormal];
    [button setTitleColor:[UIColor greenColor] forState:UIControlStateNormal];
    [button setBackgroundColor:[UIColor orangeColor]];
  //  n--;
}
else
{        [button setTitle:@"Show More" forState:UIControlStateNormal];
    [button setBackgroundColor:[UIColor clearColor]];
}
NSLog(@"n==>>  %d",n);
[tbl reloadData];}

Here is my code.