button 水纹 扩散效果 简单实用 DT_LoveBtn*aiXinBtn=[DT_LoveBtn buttonWithType:UIButtonTypeCustom]; [aiXinBtn setBackgroundImage:[UIImage imageNamed:@"aixin"] forState:UIControlStateNormal]; [aiXinBtn addTarget:self action:@selector(aixin:) forControlEvents:UIControlEventTouchUpInside]; aiXi