iphone - 在禁用UIButton上

Question

当禁用按钮。不透明度降低到50％。有没有办法将不透明度降低到25％

Answer 1

我将子类化UIButton并将setEnabled:方法重写为如下形式:

- (void) setEnabled:(BOOL)enabled {
    NSLog(@"Button enabled = %d", enabled);
    [super setEnabled:enabled];


    UIColor *color = self.backgroundColor;
    if (!self.isEnabled) {
        self.backgroundColor = [color colorWithAlphaComponent:0.75];
    } else {
        self.backgroundColor = [color colorWithAlphaComponent:1.0];
    }
}