如何创建一个圆形按钮？

我想创建一个圆形按钮。这个按钮应该看起来像一个圆圈。

此代码给出了圆形矩形按钮。

UIButton *button = [UIButton buttonWithType:UIButtonTypeRoundedRect];
button.frame     = CGRectMake(100, 100, 100, 30);
UIImage  *image  = [UIImage imageNamed:@"01.png"];
[button setImage:image forState:UIControlStateNormal];
[image release];

我想出了如何创建一个圆角矩形按钮，但我想创建一个圆形按钮。我需要改变什么？

测试代码：

.h

 #import <QuartzCore/QuartzCore.h>

-(void)roundButtonDidTap:(UIButton*)tappedButton;

.m

#define ROUND_BUTTON_WIDTH_HEIGHT YourButtonWidthToBeSetHere

-(void)roundButtonDidTap:(UIButton*)tappedButton{

    NSLog(@"roundButtonDidTap Method Called");

}



UIButton *button = [UIButton buttonWithType:UIButtonTypeCustom];

[button setImage:[UIImage imageNamed:@"TimoonPumba.png"] forState:UIControlStateNormal];

[button addTarget:self action:@selector(roundButtonDidTap:) forControlEvents:UIControlEventTouchUpInside];

//width and height should be same value
button.frame = CGRectMake(0, 0, ROUND_BUTTON_WIDTH_HEIGHT, ROUND_BUTTON_WIDTH_HEIGHT);

//Clip/Clear the other pieces whichever outside the rounded corner
button.clipsToBounds = YES;

//half of the width
button.layer.cornerRadius = ROUND_BUTTON_WIDTH_HEIGHT/2.0f;
button.layer.borderColor=[UIColor redColor].CGColor;
button.layer.borderWidth=2.0f;

[self.view addSubview:button];

Result

这个概念中的几何