ios UIButton改背景

以下orangeButton.png与orangeButtonHighlight.png分别用于按钮平常状态和被点击时的状态：

UIImage *buttonImage = [[UIImage imageNamed:@"orangeButton.png"] resizableImageWithCapInsets:UIEdgeInsetsMake(, , , )];
UIImage *buttonImageHighlight = [[UIImage imageNamed:@"orangeButtonHighlight.png"] resizableImageWithCapInsets:UIEdgeInsetsMake(, , , )];

// Set the background for any states you plan to use
[saveButton setBackgroundImage:buttonImage forState:UIControlStateNormal];
[saveButton setBackgroundImage:buttonImageHighlight forState:UIControlStateHighlighted];

代码创建一个UIButton：

UIButton *btnClear = [[UIButton alloc] init];
btnClear = [[UIButton buttonWithType:UIButtonTypeCustom] retain];
btnClear.frame = CGRectMake(, , , );
[btnClear setTitle:@"Clear" forState:UIControlStateNormal];
[btnClear setBackgroundImage:[UIImage imageNamed:@"blue_button.png"] forState:UIControlStateNormal];
[btnClear addTarget:self action:@selector(clearAction:) forControlEvents:UIControlEventTouchUpInside];

[self.view addSubview:btnClear];