点击按钮改变textField的状态

创建一个TextField

//创建一个按钮,用来textfield切换状态

UIButton *changePicbutton=[UIButton
buttonWithType:UIButtonTypeSystem];
changePicbutton.frame=CGRectMake(100,
200, 50,
50);

[changePicbutton setImage:[UIImage
imageNamed:@"check.png"]
forState:UIControlStateNormal];

[changePicbutton addTarget:self
action:@selector(changePic:)
forControlEvents:UIControlEventTouchUpInside];

self.isClick=NO;

[self.window
addSubview:changePicbutton];

-(void)changePic:(UIButton *)button
{

if (self.isClick) {

[button setImage:[UIImage
imageNamed:@"check.png"]
forState:UIControlStateNormal];
}else{

[button setImage:[UIImage
imageNamed:@"checked.png"]
forState:UIControlStateNormal];
}

self.isClick=!self.isClick
;

self.textField.secureTextEntry=!self.textField.secureTextEntry;
}