自定义控件的初始化方法

//通过代码调用

- (id)initWithFrame:(CGRect)frame

{

self = [super initWithFrame:frame];

if (self) {

[self commonInit];

}

return self;

}

//通过xib调用

- (id)initWithCoder:(NSCoder*)coder

{

if ((self = [super initWithCoder:coder])) {

[self commonInit];

}

return self;

}

- (void)commonInit

{

}