iOS颜色拾取器
WSColorImageView *ws = [[WSColorImageView alloc]initWithFrame:CGRectMake(self.view.frame.size.width/2-100, 300, 200, 200)];
[self.view addSubview:ws];
ws.currentColorBlock = ^(UIColor *color){
label.textColor = color;
view.backgroundColor = color;
};