ios - 更改字体时应用程序崩溃

Question

这就是我如何更改导航栏的背景并尝试像这样设置字体

UIImage *image = [UIImage imageNamed:@"header.png"];
UIImageView *imageView = [[UIImageView alloc] initWithImage:image];        

UILabel *tmpTitleLabel = [[UILabel alloc] initWithFrame:CGRectMake(120, 0, 100, 40)];
[tmpTitleLabel font:[UIFont systemFontOfSize:12]];  
// APP CRASH (IF I ERASH THIS ABOVE LINE THEN TITLE GET DISPLAYED AS FACEBOOK )

tmpTitleLabel.text = @"Facebook";
tmpTitleLabel.backgroundColor = [UIColor clearColor];

tmpTitleLabel.textColor = [UIColor whiteColor];

CGRect applicationFrame = CGRectMake(0, 0, 300, 40);
UIView * newView = [[[UIView alloc] initWithFrame:applicationFrame] autorelease];
[newView addSubview:imageView];
[newView addSubview:tmpTitleLabel];

[self.navigationController.navigationBar addSubview:newView];

我做错了什么？我检查了很多答案，但这就是他们设置字体的方式。

Answer 1

[tmpTitleLabel 字体:[UIFont systemFontOfSize:12]];

这是错误的。您正在使用 getter 而不是 setter。您错过了 set 部分和大写 F。

[tmpTitleLabel setFont:[UIFont systemFontOfSize:12]];
               ^^^^ 

或者像这样使用点语法:

tmpTitleLabel.font = [UIFont systemFontOfSize:12];