继承UISlider重写这个方法
-(CGRect)thumbRectForBounds:(CGRect)bounds trackRect:(CGRect)rect value:(float)value{
rect.origin.x=rect.origin.x-5;
rect.size.width=rect.size.width+10;
return CGRectInset([super thumbRectForBounds:bounds trackRect:rect value:value],5,5);
}
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