ios 弯状button ios 按钮形状

/** 初始化buttonWithType类型
UIButtonTypeCustom = 0,默认无样式
UIButtonTypeSystem,系统按钮（iOS 7以上版本），慎用
UIButtonTypeDetailDisclosure,蓝色箭头按钮
UIButtonTypeInfoLight,亮色圆圈叹号按钮
UIButtonTypeInfoDark,深色圆圈叹号按钮
UIButtonTypeContactAdd,蓝色加号按钮
UIButtonTypeRoundedRect圆角矩形
*/
TTButton *button = [TTButtonbuttonWithType:UIButtonTypeCustom];
//按钮尺寸
button.frame = (CGRect){CGPointZero,CGSizeMake(100,100)};
//按钮位置
button.center = self.view.center;
//按钮背景色
[button setBackgroundColor:[UIColor orangeColor]];
// tintColor属性慎用，这跟上面所说的UIButtonTypeSystem类型有关系，如果初始化类型为UIButtonTypeSystem，同样也设置了tintColor属性，则在设置图片的时候会收到这个tintColor颜色的影响
[button setTintColor:[UIColoryellowColor]];
//默认为NO，如果设置为YES，当按钮的状态进行切换时，(如果设置了图片则图片，否则就是文本)会闪出类似位灯的闪烁效果
button.reversesTitleShadowWhenHighlighted =NO;
//默认为YES，当按钮高亮的时候，按钮图片会变暗，设置NO为取消此功能
button.adjustsImageWhenHighlighted =NO;
//与上面属性一样，此为禁用状态
button.adjustsImageWhenDisabled =NO;
//属性设置为YES的状态下，按钮按下会发光
button.showsTouchWhenHighlighted =YES;
// UIEdgeInsetsMake(上，左，底，右)内容（图片与文本）间距
button.contentEdgeInsets =UIEdgeInsetsMake(0,0, 0,0);
//文本间距
button.titleEdgeInsets =UIEdgeInsetsMake(0,0, 0,0);
//图片间距
button.imageEdgeInsets =UIEdgeInsetsMake(0,0, 0,0);
/* 设置title、titleColor、image、backgroundImage等属性的forState状态
UIControlStateNormal普通状态
UIControlStateHighlighted高亮状态
UIControlStateDisabled禁用状态
UIControlStateSelected选中状态
UIControlStateFocused聚焦状态(iOS 9新增)
UIControlStateApplication当应用程序标志使用时
UIControlStateReserved内部框架预留使用，不用管
*/
[button setTitleColor:[UIColorwhiteColor] forState:UIControlStateNormal];
[button setTitleColor:[UIColorblackColor] forState:UIControlStateSelected];
[button setTitle:@"按钮"forState:UIControlStateNormal];
[button setTitle:@"选中"forState:UIControlStateSelected];
// titleLabel属性是只读的，但是他的属性是可读写。另外关于titleLabel文本不显示问题，打印出来看一下（<UIButtonLabel: 0x7f9070fc46b0; frame = (0 0; 0 0); text = 'Test'; hidden = YES; opaque = NO; userInteractionEnabled = NO; layer = <_UILabelLayer: 0x7f9070fc4d50>>）发现frame = (0 0; 0 0)，hidden = YES。但是设置这两个属性后依然没有显示，hidden依旧为YES。目前还不明白这是为何
button.titleLabel.text =@"Test";
//按钮图片，不会覆盖整个图片
[button setImage:[UIImageimageNamed:@"image"]forState:UIControlStateNormal];
[button setImage:[UIImageimageNamed:@"imageSelected"]forState:UIControlStateSelected];
//按钮背景图片，会覆盖整个按钮
[button setBackgroundImage:[UIImageimageNamed:@"bgImage"]forState:UIControlStateNormal];
[button setBackgroundImage:[UIImageimageNamed:@"bgImage"]forState:UIControlStateNormal];
/**监听按钮的选中事件，方法clickButton必须实现，不然会crash
UIControlEventTouchDown           按下触发
UIControlEventTouchDownRepeat     按下多次触发
UIControlEventTouchDragInside     按下后在按钮一定的外围拖动触发
UIControlEventTouchDragOutside    保持按下，在按钮外面拖动
UIControlEventTouchDragEnter       DragOutside->DragInside触发
UIControlEventTouchDragExit       内到外触发
UIControlEventTouchUpInside       在按钮一定外围内松开触发
UIControlEventTouchUpOutside      按钮外面松开
UIControlEventTouchCancel         点击取消
*/
[button addTarget:selfaction:@selector(clickButton:)forControlEvents:UIControlEventTouchUpInside];
[self.viewaddSubview:button];

/**重写按钮的方法，有些常有的按钮需求，按给出的属性设置会比较棘手，这时就会用到下面几个方法
下面演示titleRectForContentRect和imageRectForContentRect两个方法
- (CGRect)backgroundRectForBounds:(CGRect)bounds;
- (CGRect)contentRectForBounds:(CGRect)bounds;
- (CGRect)titleRectForContentRect:(CGRect)contentRect;常用
- (CGRect)imageRectForContentRect:(CGRect)contentRect;常用
*/
//首先新建一个类，继承于UIButton
// 在.m文件重写titleRectForContentRect和imageRectForContentRect两个方法
@implementation TTButton
- (CGRect)titleRectForContentRect:(CGRect)contentRect
{
    CGRect frame = contentRect;
    frame.origin.x =10;
    frame.origin.y =10;
    frame.size.width =50;
    frame.size.height =50;
    return frame;
}
- (CGRect)imageRectForContentRect:(CGRect)contentRect
{
    //可根据文本的宽度设置图片的位置，根据字体获取宽度可看我上篇UILabel文章
    NSString *string =self.currentTitle; //  获取当前文本
    CGRect frame = contentRect;
    frame.origin.x =10;
    frame.origin.y =10;
    frame.size.width =50;
    frame.size.height =50;
    return frame;
}
@end

PS：如有错误及遗漏，欢迎指点！