常用片段

-(void)creatLabel

{

label = [[UILabelalloc] init];

label.frame=CGRectMake(60, 100, 200, 50);

NSString *text = @"这是一个测试！！！";

label.text = text;

[labelsetNumberOfLines:0];

UIFont *font = [UIFontfontWithName:@"Arial"size:14];

label.font = font;

[self.viewaddSubview:label];

}

-(void)creatBtn

{

UIButton
*btn = [UIButtonbuttonWithType:UIButtonTypeRoundedRect];//初始化button，选择button类型

btn.frame = CGRectMake(130, 100, 90, 35);//大小和位置

[btn setTitle:@"ZoomIn"forState:UIControlStateNormal];//正常状况下button显示的标题

[btn addTarget:selfaction:@selector(showSelectmessage)
forControlEvents:UIControlEventTouchUpInside];//

[self.view  addSubview:btn];

}