为 backBarButtonItem 制作自定义标题视图

Question

我正在使用 PNG 制作一个自定义 backBarButtonItem ，效果很好。唯一的问题是如何更改文本颜色。我在导航栏上这样做的方式是这样的：

CGRect frame = CGRectMake(0, 0, 400, 44);
UILabel *label = [[[UILabel alloc] initWithFrame:frame] autorelease];
label.backgroundColor = [UIColor clearColor];
label.font = [UIFont boldSystemFontOfSize:20.0];
label.shadowColor = [UIColor colorWithWhite:0.0 alpha:0.5];
label.textAlignment = UITextAlignmentCenter;
label.textColor = [UIColor colorWithPatternImage:[UIImage imageNamed:@"aColor.png"]];
self.navigationItem.titleView = label;
label.text = @"aTitle";

Answer 1

不要使用 autorelease 将标签设置为 titleview，分配它们后释放它们

        CGRect frame = CGRectMake(0, 0, 400, 44);

        UILabel *label = [[UILabel alloc] initWithFrame:frame];

        label.backgroundColor = [UIColor clearColor];

        label.font = [UIFont boldSystemFontOfSize:20.0];

        label.shadowColor = [UIColor colorWithWhite:0.0 alpha:0.5];

        label.textAlignment = UITextAlignmentCenter;

        label.textColor = [UIColor colorWithPatternImage:[UIImage imageNamed:@"aColor.png"]];

        label.text = @"aTitle";

        self.navigationItem.titleView = label;

        [label release];