Xcode 6 圆角矩形按钮问题

Question

在 Xcode 6 和 iOS 8.1 的 Objective-C 视图控制器中以编程方式创建圆角矩形按钮的尝试只会产生非圆角矩形按钮。正在使用 UIButton buttonWithType: 方法。

为什么？

//
//  ViewController.m
//

#import "ViewController.h"

@interface ViewController ()

@end

@implementation ViewController

- (void)loadView // Called the first time the view property is accessed.
{
    CGRect viewRect = [[UIScreen mainScreen] bounds];
    UIView *view = [[UIView alloc] initWithFrame:viewRect];
    self.view = view;
}

- (void)viewDidLoad
{
    [super viewDidLoad];
    // Set the view's background color.
    self.view.backgroundColor = [UIColor colorWithRed:0.462 green:0.999 blue:0.999 alpha:1.0];

    // Create a button.
    UIButton *btn = [UIButton buttonWithType:UIButtonTypeRoundedRect];
    // Place and size the button on the screen.
    btn.frame = CGRectMake(100, 100, 90, 44);
    // Set the button's background color.
    btn.backgroundColor = [UIColor yellowColor];
    // Set the button's normal title.
    [btn setTitle:@"Test Button" forState:UIControlStateNormal];
    // Add the button as a subview.
    [self.view addSubview:btn];
}

- (void)didReceiveMemoryWarning {
    [super didReceiveMemoryWarning];
    // Dispose of any resources that can be recreated.
}

@end

Answer 1

添加此行并尝试：

btn.layer.cornerRadius = 5;